Rightly said, if you love your sister or your mother(incest), woudl you like to marry her? Medically not advisable to marry close relatives and regret later. Passion for SEX is very strong in the early ages. As s*x is blind. In all spheres of life, as human being one needs to control, considering the pros and cons(merits and demerits) thinking, knowing the limits and tolerances, to finally arrive at a discretion, to choose your life-partner through matrimonial Ads.Sites, through your own friends and relatives(well-wishers), single clubs etc.
Agree, SEX is very important in one's own life, for pleasure and reproductory, viewing your generation tree, your own offsprings of the future. Consider your own image in the society you live in. We would not have interacted in the lawyersclubindia inter-active platform if we did not exist, if s*x wasn't there. Don't regret later. This world is big enough and you can select anybody outside your family tree. Read good books on genes and this will open your eyes of enlightenment.