Okay so I'm 18 and a virgin, and i just started university this september. Its been really fun but I have a problem, it seems like every time I get a girl back to my room they never want to go all the way (penetration).

I don't keep pestering them to come back with me or anything, its always them who wants to go back to my room and this has happened 4 times, once every weekend but every time the girl either just wants to cuddle, make out, or at best a blow job, but no real sex.

Is there some sort of message/signal im giving out that attracts these kinds of girls to me?

well you can play it cool (get up check your email) called a freeze out.

you can tell them other girls do it why won't they (make them jealous)

or use johnny soporno technique (there is no such thing as a slut)

but I wouldn't worry about it too much, at least you are getting some play, sex will come as you get more experience and can convey that experience (its a turn on).

Oh, you might also try getting them really horny (give good hand job but not all the way) or massage them, kiss their back slowly or other parts slowly. Get them horny like this then stop or show disinterest. Then do it again. Then stop or slow down and tease them about restricting themselves too much.

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When pretending not to care what she thinks becomes really not caring what any of them think...that day I will be a PUA.