<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-04-19</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000897075</issuerCik>
        <issuerName>REPROS THERAPEUTICS INC.</issuerName>
        <issuerTradingSymbol>RPRX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001358629</rptOwnerCik>
            <rptOwnerName>Oliveira Steven Michael</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>18 FIELDSTONE COURT</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW CITY</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10956</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock, par value $0.001 per share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1315672</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Chardan SPAC Asset Management, LLC and PFSI FBO Steven Oliveira Roth IRA</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Steven M. Oliveira may be deemed to be the beneficial owner of the shares of Common Stock beneficially owned by Chardan SPAC Asset Management, LLC and PFSI FBO Steven Oliveira Roth IRA as he may direct the vote and disposition of the shares owned by Chardan SPAC Asset Management, LLC and PFSI FBO Steven Oliveira Roth IRA, however, Steven M. Oliveira expressly disclaims beneficial ownership of all shares of Common Stock beneficially owned by Chardan SPAC Asset Management, LLC and PFSI FBO Steven Oliveira Roth IRA to the extent of his direct or indirect pecuniary interest therein, and this Form 3 shall not be deemed to be an admission that Mr. Oliveira is the beneficial owner of the shares of common stock reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended or for any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Steven M. Oliveira</signatureName>
        <signatureDate>2011-04-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
