Let's just hold up one minute here. You would not have been fine with a one-night stand with MALFOY. Let's just be clear about that. I have the emotional depth of a tablespoon (I upgraded myself after the break-up with Hermione) and even I know that. So I say you just admit that and move on.
Now, the touching. I can't say I know what that's about, but Dean and Seamus are very physical with each other, and Luna touches everyone all the time. I think it's just, you know, individual differences and not a Slytherin thing. I mean, can you imagine SNAPE going around touching everyone all the time? And he's the Slytherinest Slytherin to Slytherin.
Important question: Do you like him touching you? Sure it's weird, but is it good weird or bad weird?