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Is it true that when you have sex it stretches the vagina out.. basically when having sex it makes the hole bigger.. true or not?
For a few minutes, maybe, as part of inner vagina (called the orgasmic plateau) may expand or "balloon" during arousal.
However, regular sex, even frequent sex does not "stretch" the vagina any more than eating stretches your mouth and makes it permenatly bigger or pooping stretches your anus and makes it bigger. (BTW, these activities don't stretch your mouth or anus, either does sex. Either vaginal sex or oral or anal sex.)
Orifices in the human body were made to stretch to accommodate and go back to normal size. The vagina isn't any different.
At rest the vagina, even of a very experienced woman has the sides touching and is "closed."