Images of two+ boys seriously into each other that would have be worthy additions to yaoi - if it weren't for the unfortunate technicality of a female or futanari being involved as well.
To be qualified for the pool, the image should have at least one of these criteria:
1. Focused on the boys, with the girl being covered up, out-of-frame, or similar. The guys should be emotionally focused on each other almost completely, perhaps going as far as treating the girl as little more than a sex toy used to give each other physical pleasure.
2. The female in question appears masculine enough to be easily mistaken for a dude.
3. Very masculine futanari, easily mistaken for a boy.
See also pool #2138 - "Almost Yuri".