Perhaps I am the strange one, but never got any sensation out of topping, so I figured WHY bother ? As well, I really cant come from being sucked either, BUT when I am the one doing the sucking, I can orgasm great with a "handie"..... I've come to realize its more a mental thing, which allows me to only come doing what I truly ENJOY.
It may not be the popular choice, but it works for ME.