First, go get your asshole reamed while a chick rubs your Johnson. You'll change your mind in a hurry. Not only that, but you'll probably make out with the girl afterwards without making her brush her teeth or use mouthwash. Suffice to say, you'll be an indirect shit-eater yourself.
Second, have some chick rub your prostate (yes, that means she'll have to stick a finger in yer pooper) while she sucks you off. You'll cum buckets.
Does that make you secretly gay? No.
It means you're comfortable with your body and your sexuality.
As far as shit-eating is concerned, I agree with Eggs. It transcends your sexual preference.
Though, if you think only gay men eat shit, I'd recommend finding the video of 2girls1cup. That'll whet your appetite.