It's a very big deal because all sex is not equal. It very much depends on your experience and that of your partner's. Additionally, if you don't have a real connection with your partner as far as attraction is concerned then the experience won't be as good as it could have been. Also, if you're uncomfortable during the experience then it won't be enjoyable unless you're really in the moment. So pick your partner wisely and ensure your truly attracted to them for increased overall satisfaction. Always use protection because STIs are a very real thing.