Probably doesn't matter what you call it, though it does matter that we not deny people the reality of the committed relationship. My take on this is that is that it is better that people are in committed rather than uncommitted sexual relationships.
I do not think that sexual relationships are neutral. If you have sex with someone then it has consequences. Although you can play all sorts of interesting games, ' friends with benefits ' or 'this is just sex', the reality is that as soon as you touch your naughty bits (I am trying here to be delicate for the sake of the community of faith ) then you elicit more than just fun!!!