Good communication is key to any healthy relationship whether in the workplace or at home and it is especially important in the bedroom.
Before you enter into any sexual relationship you need to establish a few necessary parameters and communication is one of them. You must be comfortable enough with your partner to discuss anything. You are a human and the human body while beautiful, is also gross as well. Welcome to reality folks, make sure you and your partner are comfortable with it or you might as well go back to watching movies where everything looks and sounds perfect.
People get older and as we do, we gain a whole host of new and gross things that are bodies show us on a daily basis. Learn to laugh at them and not be embarrassed. If you feel embarrassed with your partner, then you will not be able to fully enjoy each other sexually or otherwise.
Be honest! I cannot stress this enough. You must be honest with yourself about what you like and dislike and in turn, be honest with your partner as well. Remember that your ultimate goal is to learn how to be the best lover you can be for your partner and to help them be the best lover for you. It is a learning and ever evolving process that will continue throughout your relationship and being dishonest will only hurt you in the long run.
Acceptance is just as important as honesty. Both you and your partner will most likely have had past sexual relationships. Get over it before you start. You must accept this as a fact and be ok with it. If you can't and it nags at the back of your mind constantly then you need to talk it out with your partner. What's past is past, there isn't a damn thing you can do about it and it can't hurt you so just accept it and move on. Learning about a prospective partners sexual history can be uncomfortable and even bring up feelings of jealousy but don't let that stop you from learning about your partner. There will be things they liked and didn't like and we don't want to repeat the didn't liked bits. With each relationship we walk away from, we can take away knowledge about ourselves and that can not only make us a better person but a better partner romantically and sexually.
