Bhagavatapurana 2.10.26

2.10.26

nirabhidyata śiśno vai prajānandāmṛtārthinaḥ /
upastha āsīt kāmānāṃ priyaṃ tadubhayāśrayam //

26. When He thought of offspring, pleasure and heavenly bliss, *Sisna* (the member of the body in which the generative organ is imbedded) sprang forth (with the presiding deity *Prajapati*); and the pleasure arising from the satisfaction of desires depends upon them both.