Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 49

Sanskrit:

ततोऽपरामुपादाय स सर्गाय मनो दधे ॥ ४९ ॥

ITRANS:

tato ’parām upādāyasa sargāya mano dadhe

Translation:

Thereafter Brahmā accepted another body, in which sex life was not forbidden, and thus he engaged himself in the matter of further creation.

Purport:

In his former body, which was transcendental, affection for sex life was forbidden, and Brahmā therefore had to accept another body to allow himself to be connected with sex. He thus engaged himself in the matter of creation. His former body transformed into fog, as previously described.