You're right about that, plus most men's jeans don't have much room in the butt for, well, butt. Try to look for jeans that don't have a large bulge in the hips-- The straighter the outseam, the less the hips are emphasized. If you have large hips, look for something slightly baggier at the shin and ankle to balance. It's probably not going to be easy to find, but they are out there.
I've heard of Boyfriend Jeans having a more masculine fit (think Boyfriend Shirts), but I haven't tried them myself. Usually, I just buy pants from the boys section at Goodwill/Savers. They usually go by the same single number system as women's pants, but they don't have that feminine cut. Of course, I can only do that because I'm wicked short, but...