If there is a link between the two events, it is most likely an emotional/psychological one, rather than a physical one. Many people have strong feelings about having sex for the first time, and they can be positive, negative or a mixture of both. These feelings an especially be exacerbated if a person has a strong opinion about whether having sex is appropriate, or whether having sex with this particular person is appropriate, or if they are concerned about how well they performed. Any of these factors could possibly be affecting your subsequent sexual experiences. Often, time takes care of it; in other instances, talking to a professional (such as a psychotherapist) can help to work through what is going on. It IS possible that there could be a physical link; for example, if the sex was very rough or if you slammed your erect penis painfully into a pelvic bone, you may have experienced some penis trauma. Rest and applying a quality penis health cream (health professionals recommend Man1 Man Oil) will help with any minor penis trauma (and indeed, regularly using a penis health cream is a good idea whether trauma has been experienced or not). Use a cream that include a top rated moisturizer, such as shea butter.
I used to be able to get hard fast and easy but ever since I started having sex its harder for me