Sahih Bukhari Volume 7, Book 62, Number 173:

Narrated Jabir bin 'Abdullah:




The Prophet said, "If you enter (your town) at night (after coming from a journey), do not enter upon your family till the woman whose husband was absent (from the house) shaves her pubic hair and the woman with unkempt hair, combs her hair" Allah's Apostle further said, "(O Jabir!) Seek to have offspring, seek to have offspring!"