Why?

I registered here pretty much to ask this. I have never heard of any of this "wam" before a few days ago, courtesy of my bf. I think he thinks he is cleverer than he really is. I've found some very interesting things on his Internet history, including this forum (I don't think he posts here though.) I have not said anything to him about it yet, honestly I'm nervous because i don't know what to say and I'm sure he'll be petrified if he knew that I knew. We've been going strong for over a year, so no I'm not going to stop loving him because of this, but he might be more paranoid.
Anyway, sorry for ranting. Basically I'm just interested in knowing why you guys, my bf, others, like this. Why does it turn you guys on to see a girl look like a mess wearing ruined clothes compared to looking pretty with clean clothes, makeup, hair, like normal? And anyway don't you feel bad that all the effort that went into the girls appearance is ruined, and so are clothes (getting ready takes forever and clothes are way too expensive). And what do you want to see a girl wearing for this (I'm imagining a bunch of guys saying "nothing" - but seriously, if I'm not into getting naked then what).
Sorry if I'm intruding or acting a bit rude just realize this is sort of a shock lol. I'll get over it though. No idea if I'd ever want to actually do this for him but I'd like to be accepting, and first I have to understand what is going through his mind.
Thanks
Anyway, sorry for ranting. Basically I'm just interested in knowing why you guys, my bf, others, like this. Why does it turn you guys on to see a girl look like a mess wearing ruined clothes compared to looking pretty with clean clothes, makeup, hair, like normal? And anyway don't you feel bad that all the effort that went into the girls appearance is ruined, and so are clothes (getting ready takes forever and clothes are way too expensive). And what do you want to see a girl wearing for this (I'm imagining a bunch of guys saying "nothing" - but seriously, if I'm not into getting naked then what).
Sorry if I'm intruding or acting a bit rude just realize this is sort of a shock lol. I'll get over it though. No idea if I'd ever want to actually do this for him but I'd like to be accepting, and first I have to understand what is going through his mind.
Thanks