....you know what he meant. I'm so sorry one technicality that is important to you wasn't mentioned.
The only time this really becomes of issue is threesome content guys find too "gay" for them. This is sometimes NOT subject to the "if you don't want it don't click it" rule because oftentimes the content that makes straight guys uncomfortable is not part of the thread at hand.
Masturbation....who cares. You know what you'll be seeing and can avoid it. The threesomes are where things get murky, and perhaps should be put in the everything else section, but there is plenty of "straight" content that involves two guys going at a girl.
I would argue that the "straight/gay/stuff we can't categorize" breakdown is not nearly nuanced enough. If it were, Aconitum's summary would work (except the TS case).
SO in conclusion....this system works well enough. If you need a porn forum with fewer dicks around.....well you came to just about the worst straight porn site on the internet for that given this forum's overarching purpose. You have no one to blame but yourselves for continuing to come here if it so offends you.