SB 3.12.53

tābhyāṁ rūpa-vibhāgābhyāṁ
 mithunaṁ samapadyata
Word for word: 
tābhyām — of them; rūpa — form; vibhāgābhyām — thus being divided; mithunam — sex relation; samapadyata — perfectly executed.
Translation: 
The two newly separated bodies united together in a sexual relationship.