It's hard to explain,though I can relate.My GF and I have a very open dialogue,and we've told each other about certain notable sexual encounters.She is a very sexual person and quite 'experienced'.
One day she told me a story about a threesome she had with a swinger couple.She explained in great detail about the Husband being 'huge' in her words,like 12 inches huge.While it was an estimate,she's very open,experienced,and is a nurse to boot,so I'm sure she's seen cocks of all sizes,and this particular guy is the only one's she's mentioned a few times.She says she's had 'big cock' before me,in her words,but when we discussed her limit,she said most definitely him.
Seeing as I'm a legit 7.5 long when fully aroused,and she's never made any sort of comment to me regarding my size(other than I have no worries),and she said she's had 'big cock' before,I have to wonder about this guy.He must be pretty exceptional.But in anay event,upon her telling me the story,the sex afterwards was very hot because I was aroused by her experience,though I 've never told her that the thought of her being with an extreme-sized penis was a turn-on....