I suppose by "intimacy " you mean sex and I will continue on that assumption.
Mama is correctly......it varies but on the whole, men need exciting, satisfying and innovative sex, preferably with the wife or partner,but if that is not available then a mistress or prostitution.
If you are a woman couldn't care about sex and have a partner who also isn't interested then you may well be on to a stable relationship.
However....if one of you needs sex and the other doesn't then,as the song goes "there could be trouble ahead"
///At What Age Does The Intimacy Go Away/
With the right partner,at the right place,during the right time...it doesn't go away.