I thought of more than four. But I still think the disadvantages greatly outweigh the advantages.
If a gay man gets into a romantic relationship with me at this point, I'll know it's for ME, despite my not having had SRS (yet).
When women complain about that time of the month, I can sympathize from personal experience, even if they don't know it.
I know all about everyday sexism, the kind that a lot of men do unconsciously. Like the guys who talked to my chest instead of my face. Or the guys who talked down to me because they thought I couldn't possibly know about the subject at hand. Or the guys who acted differently toward me when they realized that I did indeed have a brain and the will to use it.
I escaped a traffic ticket once just by being young, blond, and female. And I wasn't trying to get out of it. (This wasn't just a freebie that I took advantage of; I learned from the experience and was more careful in the future. Another example of sexism in action, though.)
A few straight male friends told me personal things that they probably wouldn't have shared with a regular guy.