Have you ever had a girl backing out of having sex with you because she thought you are too big?

If yes,
how did she do it? what did she say?
do you think she was experienced?
did you expect her to be a "tight fit"?
did she offer you something else like blowjob or handjob?
did she change her mind later on and when yes - why?
if she changed her mind - how was the sex?