I find it funny when a straight guy says he doesn't find ANY male on the planet handsome. I mean, I know you have to protect your very very very fragile masculinity because, for reasons unknown, it is also very very very important, but we are all bombarded by media and society with information describing how an attractive male should look like, regardless of us wanting to receive that information or not (unless you live in a cave, with no internet access or TV and haven't touched a magazine or a newspaper or had contact with other human being in ages, which you don't). So, in theory, we all know what constitutes a good-looking male and what constitutes a beautiful female. You have all the right on earth to not be attracted to one of them or even both, but I'm sure you DO know how to differentiate from a conventionally good-looking or attractive person from a not so good-looking one, regardless of their gender. Of course, social and cultural influences and, perhaps most importantly, individual differences or preferences do apply in this case, but you would still know what makes a person to be defined as attractive within your own culture.
Off topic, but this is something that bothers me a lot. No one comes to a straight couple they have just met and start asking questions about what they do on bed (might not be the case with your friend, just using this as an example because I guess it kind of fits). Why do people think they have the right to ask this to gay/lesbian couples? Drives me insane!

You've just met someone! You DO NOT GET TO ASK what they do in bed. It's private, personal and you have nothing to do with it.
It is one of the few opportunities that I'll allow me the right to be unpleasant and start asking the same questions or worse to the person that started the awkward conversation.