I believe guys are generally asked first because they have more suggestions, so if they say no, the girl never finds out and doesn’t feel bad, and the guy moves on to the next.
If a girl says yes and the guy says no, her feelings can be hurt. She’ll sulk and pine till the next suggestion comes along, which may not be for months.
If the guy says yes and the girl says no, he can feel bad for a minute and then say, “Next!”