>>2996413>Try with the "femboy" tag nowOkay.
>Rule34yaoi only: 309.119 results
trap only: 53.557 results
femboy only: 111.211 results
crossdressing only: 39.934 results
yaoi + femboy: 28.480 results, 9.2% of yaoi only results
yaoi + trap + femboy: 13.960 results, 4.5% of yaoi only results, 26% of trap only results, 12.5% of femboy only results
yaoi + crossdressing: 10.080 results, 3.2% of yaoi only results
yaoi + trap + crossdressing: 5.360 results, 1.7% of yaoi only results, 10% of trap only results, 13.4% of crossdressing only results
trap + femboy: 42.600 results, 38.3% of femboy only results
trap + crossdressing: 16.720 results, 41.8% of crossdressing only results
trap + femboy + crossdressing: 13.920 results, 26% of trap only results, 12.5% of femboy only results, 34.8% of crossdressing only results
femboy + crossdressing: 20.840 results, 18.7% of femboy only results, 52.1% of crossdressing only results
>Gelbooruyaoi only: 98.000 results
trap only: 65.000 results
crossdressing only: 42.000 results
yaoi + crossdressing: 3.330 results, 3.3% of yaoi only results
yaoi + trap + crossdressing: 2.480 results, 2.5% of yaoi only results, 3.8% of trap only results, 5.9% of crossdressing only results
trap + crossdressing: 19.080 results, 45.4% of crossdressing only results
Keep in mind that the only femboy tag on gelbooru is a meme one with 74 results, which is why I didn't compare it.
Now then, as you can see comparing yaoi with femboy changes nothing, it's still less than 10% of yaoi content, same with crossdressing and if you add trap to the comparison the numbers decrease.
Comparing trap with femboy and crossdressing separately shows that less than half of femboy and crossdressing content have the trap tag and when comparing all three the numbers decrease. This wasn't what you asked, but this comparison shows that those three terms aren't treated as the same thing, a crossdresser doesn't have to be a femboy or trap and a femboy isn't necessarily a trap.