It is common for people to experience some discomfort or pain during their first sexual experience, as the body may not be used to the sensation of penetration. However, if the pain is severe or persists, it is important to consult a healthcare provider. They can help determine the cause of the pain and recommend appropriate treatment options.

There are several things that can cause pain during first-time sex, including:

1. Vaginal dryness: Vaginal dryness can make penetration painful. Using lubrication can help reduce discomfort.
2. Vaginismus: Vaginismus is a condition that causes the muscles of the vagina to contract involuntarily, making penetration painful.
3. Lack of arousal: Arousal helps the vagina relax and produce lubrication, which can make penetration more comfortable.
4. Psychological factors: Stress, anxiety, and past sexual trauma can all contribute to pain during sex.

It is important to remember that everyone is different and that what feels comfortable for one person may not be comfortable for another. It is also important to communicate with your partner about your boundaries and to stop any activity that is painful or uncomfortable. If you are experiencing severe or persistent pain during sex, it is important to consult a healthcare provider. They can help determine the cause of the pain and recommend appropriate treatment options.