im not a guy but i can tell you what my man likes. he likes when i control the situation. when i nibble on his ear and neck and when i pull his hair.
now are you asking in general or do you have a guy in mind? personally you should ask him what he likes.
me and my bf are honest enough, i just tried a new position with him a few days ago, he told me he didnt really like it so we moved on. he also loves the backwards cowgirl