I've been married 25 years, my husband worries a lot about size, his p3nis is under 3.5 inches erect, and through intercourse he suffers with premature 9 times out of 10, we do a lot of foreplay, but he still worries because of his size etc, he has now said, if I want to, he is willing to let me try with someone else, because they will be bigger etc, I've said no, but, he has got me thinking, I will add I've only ever slept with my husband, what should I do?