My friend is having an interesting issue in his marriage.
He had a normal relationship with his wife but after the arrival of their son, their sex life has been nearly absent. His wife is stay at home mom and takes care of the baby and she seems to not be interested in sex anymore. Even my friend is becoming discouraged from approaching her for sex and even losing attraction since she generally shows disinterest. She seems to be fine in other ways. He says he does not know how to relieve his sexual needs now.

any suggestion?