There are few survey have conducted about this issue, very good football players have much longer ring finger than index finger. And male scientist normally have ring finger and index finger same length. Some people also say for woman longer ring finger will give masculine behaviour and for man longer index finger will give feminine behaviour. Also researcher found relationship between index finger and ring finger with heart attack, autism and breast cancer.
Taken from http://www.mondovista.com/homosexual.html, sexual orientation by the finger :
Man's Finger and sexual orientation
Woman's Finger and sexual orientation