No. Being able to explain 25% of sexual behavior does not mean that the remaining portion has to be explained by other factors. Ignoring the fact that other thi

No. Being able to explain 25% of sexual behavior does not mean that the remaining portion has to be explained by other factors. Ignoring the fact that other things, like hormone profiles, have additional explanatory power, many biological processes are subject to noise. The best algorithm in the world can only predict a fair die toss 1 in 6 times. It may be possible that culture is a factor, but literature reviews of sexual orientation incidence suggest that it does not vary significantly across time or place, which is a pretty compelling reason to think culture is an important factor.