Exhibit 2.1
                         HUMAN PHEROMONE SCIENCES, INC.
                           STOCK REPURCHASE AGREEMENT

         THIS STOCK REPURCHASE AGREEMENT (the "Agreement") is made as of May 21,
2003, by and between Human Pheromone  Sciences,  Inc., a California  corporation
(the "Company"), and MK GVD Fund (the "Shareholder").

                                    RECITALS

         A. The Shareholder currently holds 17,448 shares of Series BB Preferred
Stock of the Company (the "Shares") and 1,333,333  shares of Series AA Preferred
Stock of the Company ("Series AA Preferred").

         B. The Company  desires to  repurchase  from the  Shareholder,  and the
Shareholder desires to sell to the Company,  the Shares at an aggregate purchase
price of $500,000. In connection therewith,  the Company desires the Shareholder
to convert,  and the Shareholder is willing to convert,  its shares of Series AA
Preferred Stock into Common Stock of the Company.

         NOW, THEREFORE, THE PARTIES AGREE AS FOLLOWS:

         1. Repurchase of Shares; Conversion of Series AA Preferred. In exchange
for  the  Company's  delivery  of  the  Repurchase   Consideration  (as  defined
hereinafter)  at the  closing  (the  "Closing"),  which  shall take place at the
offices  of the  Company,  84 West Santa  Clara  Street,  Suite  720,  San Jose,
California  95113 on May 21, 2003 or at such other place and time as the Company
and the Shareholder  mutually agree,  Shareholder  hereby agrees to sell, assign
and transfer its entire right,  title and interest in the Shares to the Company,
and the  Shareholder  agrees to convert its shares of Series AA  Preferred  into
Common Stock. As consideration for the  Shareholder's  sale of the Shares at the
Closing,  the  Company  agrees to  deliver to Seller  the sum of  $500,000  (the
"Repurchase  Consideration").  At the Closing: (i) the Shareholder shall deliver
to the Company (a) the stock certificate(s) representing the Shares, (b) a stock
assignment  transferring  the Shares to the Company  effective as of the Closing
and (c) the stock certificate(s)  representing its shares of Series AA Preferred
for conversion,  and (ii) the Company shall initiate a bank wire transfer to the
Shareholder's   designated   bank  account  in  the  amount  of  the  Repurchase
Consideration payable as of the date of the Closing. Promptly after the Closing,
the Company shall arrange for its transfer  agent to reissue to the  Shareholder
an aggregate of 597,777 shares of Common Stock, which shares represent the total
number of shares  of  Common  Stock  issuable  on  conversion  of the  Series AA
Preferred held by the shareholder.

         2.  Representations,  Warranties,  Acknowledgments and Covenants of the
Shareholder  to  the  Company.  The  Shareholder  hereby  represents,  warrants,
acknowledges and covenants to the Company that:




         2.1 Knowledge and Advice. Michael D. Kaufman, who is a principal of the
Shareholder,  is a member of the Company's Board of Directors and he has had the
opportunity to discuss the Company's business, management, and financial affairs
with the Company's  management,  understands  the economic  implications  of the
transactions  contemplated  by this Agreement,  and has had full  opportunity to
seek advice of counsel  and any other  appropriate  advice with  respect to such
transactions.

         2.2 Ownership of Shares.  The  Shareholder  holds and will hold, and is
hereby agreeing to transfer,  good and full title to the Shares,  free and clear
of any and all liens and encumbrances.

         2.3 Preferred Stock. The Shares  represents all of the shares of Series
BB  Preferred  Stock  of  the  Company  owned  directly  or  indirectly  by  the
Shareholder,  and the Shareholder  does not own directly or indirectly any other
shares of Series BB Preferred  Stock of the  Company.  The  1,333,333  shares of
Series AA Preferred Stock being converted  pursuant to this Agreement  represent
all of the shares of Series AA Preferred Stock owned by the Shareholder.

         2.4  Authority;  Execution.  All action on the part of the  Shareholder
necessary for the  authorization,  execution and delivery of this  Agreement and
the  performance of all  obligations of the  Shareholder has been taken prior to
the Closing. This Agreement constitutes the valid and legally binding obligation
of the  Shareholder,  enforceable in accordance  with its terms,  subject to the
laws of general application relating to bankruptcy, insolvency and the relief of
debtors and rules of law governing  specific  performance,  injunctive relief or
other equitable remedies.

         3 Representations and Warranties of the Company to the Shareholder. The
Company  hereby  represents,   warrants,   acknowledges  and  covenants  to  the
Shareholder that:

         3.1  Authority;  Execution.  All  action  on the  part  of the  Company
necessary for the  authorization,  execution,  delivery and  performance  of all
obligations  of the  Company  under  this  Agreement  has  been  taken  and this
Agreement  constitutes the valid and legally  binding  obligation of the Company
enforceable in accordance with its terms subject to laws of general  application
relating to  bankruptcy,  insolvency  and the relief of debtors and rules of law
governing specific performance, injunctive relief or other equitable remedies.

         4. Miscellaneous.

         4.1  Entire   Agreement;   Successors   and  Assigns.   This  Agreement
constitutes the entire contract between the Shareholder and the Company relative
to the

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subject matter hereof.  Any previous  agreement  between the Shareholder and the
Company is superseded by this Agreement.  Subject to the exceptions specifically
set forth in this  Agreement,  the terms and conditions of this Agreement  shall
inure  to  the  benefit  of  and  be  binding  upon  the  respective  executors,
administrators, heirs, successors and assigns of the parties.

         4.2 Governing Law. This Agreement shall be governed by and construed in
accordance  with the laws of the State of California  excluding  those laws that
direct the application of the laws of another jurisdiction.

         4.3  Counterparts.  This  Agreement  may be  executed  in  two or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

         4.4  Headings.  The headings of the sections of this  Agreement are for
convenience  and shall not by themselves  determine the  interpretation  of this
Agreement.

         4.5 Notices.  Any notice required or permitted hereunder shall be given
in writing and shall be conclusively deemed effectively given upon: (a) personal
delivery;  (b) one  business  day after  deposit  with a  nationally  recognized
express  courier,  specifying  next day delivery,  with written  confirmation of
receipt;  or (c) five days after  deposit in the United States mail for domestic
delivery,  by registered or certified mail,  postage  prepaid,  addressed as set
forth below the name of each party to this  Agreement on the  signature  page of
this  Agreement  or at such other  address as a party may  designate  by 10 days
advance written notice to the other parties hereto.


         4.6 Survival of Warranties,  Representation  and  Acknowledgments.  The
warranties, representations, acknowledgments of the parties contained in or made
pursuant to this  Agreement  shall  survive the  execution  and delivery of this
Agreement.

         4.7 Costs and Expenses. Each party to this Agreement shall bear its own
costs and expenses (including  attorney's fees) incurred in association with the
execution of this Agreement.

         4.8  Amendment.  This  Agreement  may  be  amended  only  by a  written
instrument   duly   executed  by  each  of  the  parties  or  by  an  authorized
representative of each of the parties.

                            [signature page follows]

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         IN  WITNESS  WHEREOF,  the  parties  hereto  have  executed  this Stock
Repurchase Agreement as of the day and year first above written.


                                      HUMAN PHEROMONE SCIENCES, INC.
                                      a California corporation

                                      /s/  William P. Horgan
                                      ----------------------
                                      William P. Horgan

                                      Title:   Chief Executive Officer
                                      Address: Human Pheromone Sciences, Inc.
                                               84 W. Santa Clara St., Suite 720
                                               San Jose, CA  95113



                                       MK GVD FUND

                                       /s/ Michael D. Kaufman
                                       ------------------------
                                       Michael D. Kaufman

                                       Address: 2471 East Bayshore Road
                                                Suite 520
                                                Palo Alto, CA 94303