I don't know about the ky jelly, that just seems like it would make the tampon more uncomfortable to me. But I have always had a problem using tampons. As far as stretching you for sex, no it won't do that. Tampons are too small and you are too stretchy as it is that it shouldn't have any affect on you at all. Sex is plenty possible without being stretched anyways, its just uncomfortable to start with. And it varies for different women. I heard so many horror stories about how bad sex was the first time, and yes it hurt me, but it was nothing compared to the stories lol. If you haven't used a tampon yet then my suggestion is to try it without jelly first and then if it is really just too hard try the jelly.
ky will help with sex and if u are nevous when u are incerting the tampon u will have more trouble. there are slim tampons too for smaller women
Yes KY should help you insert the tampon. How old are you?