Pleasure brings its own fruit; it cannot lead to another (pleasure). Ashes may be had from wood, but nothing could be had from ashes.
न हि कामेन कामोऽन्यः साध्यते फलमेव तत्। उपयोगात् फलस्यैव काष्ठाद् भस्मेव पण्डितैः॥