really weird when they pull boys and bring them back to your house.

The lads always seem uncomfortable if you meet them. The awkwardness is pretty high. You're both aware of the reason he's in your house so you can't really talk much about "what you upto?" etc. And you don't want to have a full-on hand-shake introduction, because you'll never see them again - and if you did it'd be even more awkward.

Boyfriends are fine. They're regular and you can have a chat. One-night stands however = not good news. If you ever meet a girl who lives with a boy, don't go back to her place. Take her to yours. Please. Thanks.