I don't like it. You don't have to pay attention to answers you don't want to read, but we don't need to block them completely just based on gender. It's not useful or helpful. Also, I'm sure it's going to start problems soon enough. Guys and girls asking loaded, biased/bashing questions about the opposite gender and then restricting them from responding. It could get ugly.
I don't understand the logic behind it. This is supposed to be a girls ask guys and vice versa website. I guess the should put an asterisk underneath that says "except for when you feel like leaving a gender out".
I think it's a bad idea. Just because someone is of a different gender than yours it doesn't mean that they can't give you an helpful answer. It's like allowing only people of certain ages to answer. It makes no sense.