Body worship. Perhaps because I was a tank in MMOs for so long, I gravitated to support roles in sex too. I just like telling a chick who beautiful she is, kissing up/down her body, saying how much I like xyz, eating pussy and telling her how good she tastes, etc. On the flip side, I get hardest when a chick grabs my dick and tells me how how I am, how big etc etc.
And of course eating ass.