Well, as a bisexual male when it comes to penetrative sex, I prefer vaginal when I am the one using my penis, but I prefer an^l when I am the one receiving the penis. For me at least, when I have an^l sex my orgasms and ejaculation is much stronger and more pronounced, meaning it just feels much better. At the same time, maybe it's just the feminine side of me, but I absolutely adore the feeling of something inside of me, especially when it's controlled by someone else (ie. strap-on or real penis vs. dildo).