Which is most common?

My DH and I were discussing twins and were wondering which is more common -- twins who are of the same sex or one boy one girl.

I told him I'd ask on here because you ladies should all be the experts!

Re: Which is most common?

I don't know what I'm having but everyone tells me that are most common for fraternal - which really, its a 50/50 chance for either sperm to meet the egg, so maybe statistically there are more. Since same sex twins can be fraternal or identical I would think they're the most common type of twin overall.