you can do that too, but please do not discount yourself. There are many different tastes for many different people. I saw some boys who I really liked but on their profile explicitly stated "no one under 45" "no pollitos (which is Spanish for chick, or baby chicken as in no young people)." Others mentioned they preferred large, hairy bear types. You just have to patiently find your niche. But you still gonna need your sexiest photo, a good tagline, etc.
Sexy doesn't just mean attractive. Look it up: it also means exciting and appealing. Thus, anyone has equal chances of being sexy. ^_-
Happy Hunting!!!