When the genitals of the gigantic form separately became manifest, then Prajapati, the original living creature, entered into them with his partial semen, and thus the living entities can enjoy sex pleasure

Expressions researched:
"When the genitals of the gigantic form separately became manifest, then Prajapati, the original living creature, entered into them with his partial semen, and thus the living entities can enjoy sex pleasure"

SB Canto 3

When the genitals of the gigantic form separately became manifest, then Prajāpati, the original living creature, entered into them with his partial semen, and thus the living entities can enjoy sex pleasure.

SB 3.6.19, Translation:

When the genitals of the gigantic form separately became manifest, then Prajāpati, the original living creature, entered into them with his partial semen, and thus the living entities can enjoy sex pleasure.