[D-fendr]

how can a celibate priest advise a married couple of a man and woman about sex?

You mean about what goes where? Or do you mean that sex has nothing to do with holiness and that chastity is not part of being Christian?

[marajade]

marriage is supposed to be most about sex is it not? Even Paul wrote letters in the NT about it.

And your interpretation of sexual intimacy in a marriage isn’t so simple as you seem to want to make it to be