quite a lot of people complain about the lack of relationships (ill be a little sexist and say females- though this might be because not many lads will actually admit to another they want to settle down) they still sleep around.
Isn't the point of a relationship that you've someone with whom to sleep consistently? Sleeping around happens when you're not pleasing enough for someone to want to come back again (or if you're having trouble finding anyone you find you like enough).