I've only seen it on videos as I've never had sex with a man.  But if I were to have sex I wouldn't allow rimming.  Just kiss, suck, and fuck.  But all must be preceded with a shower.

I'd choose fat over muscle. More cushion for the pushing:)

I have membership to CSM, CF, and SeanCody from time to time to get the latest.  Mostly because its very difficult to download torrents.  I would love to get a CM account, but at the moment I can't afford it.