It's always been the ass for me, but explaining why isn't so easy. Might as well tryto explain why certain pieces of art attract the eye of someone while others can go completely unnoticed. Wait...am I comparing the ass to a work of art? Yes. In a great many cases, that's exactly what it is....
Tits for me. Its the first thing I notice and they come in so many sizes. Even clothed they are hard to ignore and watching them bounce is so much fun. Playing with them is great too and while a fine ass is nice I'd rather have my hands full of tits.