I have also found that, due to the small amount of 'available' female furs, it can get quite cut-throat among the straight male furs. Like I have to deal with my mate getting constantly hit-on and flirted with by other furs. But it's just one of those things. Yeah It happens in society anyway, but not half as much I feel as it happens in the fandom.
It can be very hard being a straight male in the fandom, I mean my friend recently turned bi and was looking for a girlfriend. but there was none that were available, so he started to try and chat-up girls who were taken, which can be very dangerous. I mean, I'm not a violent man, and I don't really care about it as I can trust my mate, obviously if it happens at a meet and I'm right there, and ALL he is doing is trying to get with my mate I will tell him to go shove it, you know. But there are other furs who are a lot more aggressive than me and will retaliate if they find out about such actions.
So i think a lot of Bi males just think it's easier and safer to go for a guy.