In the begining the sex is often and a lot of fun. After a few weeks, it's a chore and boring with little or no 'newness' to it, and the woman 'forgets' about it. By then, the 'plans', which don't include your input, are made, and you have only two choices. Argue about it, which means you lose, even if you win. Or go along and still lose because you didn't argue about it in the first place.
So why even get yourself into that situation?
Too often the committment is give and take. The man gives up sports, carousing with his buds and things he did when he was single. The woman takes all that and more, making the male more like her girlfriends, and generally emasculating the male.
There are exceptions, of course.
(Enhanced flame suit on)
Geez man, that’s not even close to marriage. I’m going on 18 years of marriage and sex is not infrequent or stale.