Dear Nency vagina is being very small and flexible. So told your partner that don't do it quickly, first try with the finger, use lubrication... But you have to be very relaxed and your partner also have to be very supportive during this activity. It is not necessary that the whole penis go inside in one time, and it is not suggested also. Read this about: https://lovematters.in/hi/news/first-time-sex-top-five-facts https://lovematters.in/hi/resource/ways-make-love If sex is between the two loving partners, safe and without any force, that's very good. If you would like to join in on an elaborate discussion on any topic, feel free to join our discussion board, ‘Just Ask’ https://lovematters.in/en/forum