Actually, believe it or not, the sexuality of furries is sort of an even split between gay, straight, and bi (According to this old ass survey from 15 years ago, the exact numbers were bi at 37.3%, straight at 32.7%, gay at 25.5%, and "other" at 8% [source:
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], but again this is old and those numbers seem to fluctuate).
The high amount of primarily gay furry stuff seems to be exclusive to games specifically, though I doubt anyone could give a definitive explanation for it.