My theory. Would you say alot of guys need sex as assurance the girl thinks you're attractive?

I have a theory. Now i understand there are other signs of finding out if a girl finds you attractive. but say none of the many signs don't happen. One might think cut your losses and move on to the next girl. But say the signs never seem to happen. One might still say cut your loss and keep taking your time threw getting to know so many girls. But then you would know that would probably take eons (ages or way way too long and no promises either). So then guys just skip straight to the source and want sex right off the bat or very very soon as assurance the girl thinks hes attractive. Otherwise if sex doesn't happen, he feels the girl doesn't think hes attractive and hes wasting his time and will on hopefully to a girl that appreciate and value his looks. Thats my theory. Do you believe alot of guys are like this?