So you are surprised when a man has a girlfriend but not when a woman has a boyfriend... Do you realize that for a woman to have a boyfriend, her boyfriend did have a girlfriend? I mean, yes, there is a 2% gap in births, but is not such a big gap for you to be surprised when a man has a girlfriend...
People ignore the people that they don't find attractive. The fact is that the women who didn't fit in the "young, standard beauty", have trouble finding dates. And even some of those have trouble finding dates because they have "unattractive" traits like "being too intelligent/outspoken/having a backbone".
At the end of the day, some people would find a partner, and others not. But for each woman who has a boyfriend, there is a man who has a girlfriend.