I, personally, cannot wear skinny/slim jeans because of my butt. However, even if I could, I would still go with straight just because I don't like to feel so constricted and I don't like the appearance of skinny jeans on guys. As for passing, I know if I were to wear them I definitely wouldn't pass since I'm pre-T and have a hard enough time of it on my own. I'm sure there are some who could pull it off.