Cooking a dinner is, I am reliably advised, a 99% sure way of getting the "desired result"
But seriously, a relationship does involve complementary activities and interests - if both are intelligent people.
Occassionally you will both have similar interests (I mean
no dissimilar interests) but that is very rare.
There are relationships, mostly old traditional sorts, where one has little to do in their life and relies on the other one for everything. A woman who has no interests of her own, who saw marriage as the solution to everything, and is now stuck at home with kids (which let's face it is a pretty common scenario) is likely to resent the man flying, or indeed having any fun at all. I don't know of a solution to that - even the application of loads of £££ won't solve that one.
Children are a major major major challenge...
Finally it has to be said that IF you have no kids, and little in the way of common interests, then finding somebody else has to be considered. This is not the 1950s or even the 1980s (when digging out a new partner was a full-time job, so most people - myself included - shacked up with the first person who was interested). It's a lot easier today.