Well, it depends. If one is 3" length then there may be a problem. If one is 5"+ then in most cases if one knows what to do in bed then there may be no issues with sex. Going
Balls deep is doable for length up to 7" and even more. But some women do not like long penises. They hurt the cervix area of most women.
It is funny how people with 7" EL want more and people with 5" EL also want more...such a complex issue this EL is!!!!