Interesting question. Certain songs from my tweens when I was just discovering my sexuality and my interest in girls really took off. Even though I'm still a virgin. Case in point: "Crash into Me" by the Dave Matthews Band. Not really that random I suppose. Also some Savage Garden songs, like "Truly Madly Deeply."

I can't really think of any other "things" that I can mention... I'm pretty normal I suppose. Maybe T-shirts and jeans on girls? I find it generally more arousing than "sexy" clothes like a little black dress or miniskirt. There's just something about casual wear, IMO. Also kissing. It doesn't even have to be foreplay or anything -- I get aroused at the idea of romance. Does that count?