I think a relationship betweet men and women can work when both, the man and the woman, make an effort . sometimes you have to work really hard on it - but in which relationship you don't have to do that?
In my opinion men should waste less thoughts on sex and everything will work
- no, just kidding.
And do we always have to fall in love with our mates? I don't think so, cause there can also be a bond without 'really deep feelings' and sex . definitely .