Because in the West it's individual, not systemic. Hypothetical singleton knows if he wanted to, he could find someone, he's just not interested right now.
Incidentally, there is a good example of a country where there are surplus males, due to healthcare priorities, and some men have 4 wives, further exacerbating the imbalance, and a culture that frowns on both casual sex and homosexuality. Perhaps you've heard of it? Afghanistan.
Incidentally, there is a good example of a country where there are surplus males, due to healthcare priorities, and some men have 4 wives, further exacerbating the imbalance, and a culture that frowns on both casual sex and homosexuality. Perhaps you've heard of it? Afghanistan.