Uh, has this become a thread about sex and TNG?
Good!
I understand that TNG is obviously an American product created in the '80s, but it's interesting how all the relationships in it reflect the social mores of the time and place. That is, very conservative (other than simply being more comfortable talking about sex).
Basically, the characters
a) are dating
b) they are married (and of course they are exclusive)
c) are only having a one-night stand.
We're never presented with other options.
Basically, the average Northern European country at the time had more choices.