Sorry, sassy doc, and my friend, a girl when in 2018 had sex with her boyfriend, has there been an imprint on her dark areas after sex?
Thank you for the question.
Sexual intercourse, if not done involving vaginal penetration, often does not cause any permanent marks. Conversely, if sexual intercourse is done by involving vaginal penetration, then there can be certain changes in the intimate organs, such as scars, tissue tears (including hymen tears), even infections (which are contracted from a partner during intercourse).
It's just, of course not all women who have had sex will experience physical changes as mentioned above. It is also not uncommon to find women who have not experienced any physical changes despite frequent sexual intercourse.
Therefore, whether or not someone has had sex can not only be determined by assessing the physical changes in their intimate organs. This is especially worth exploring from the person's own information.
Hope this helps ...