I never thought that these sites that say they only feature straight
guys were really all that credible … I mean, explain to me how these
guys are straight when they’re sucking another guy’s cock?

Well, Straight College Men
does a pretty good job of it. They feature lots of guys, but this
one in particular, Dean, a stocky young muscle guy, fucks around with
lots of them. He looks to be as straight as any breeder I know,
but with a twist - he likes to fuck guys.