With most failed marriages and relationships are the failure on both sides to communicate. With guys our communication is very limited when it comes to our women. We talk openly about sex, sports, and money but avoid talks with our partners when it comes to how to improve our relationships. Any problems need to be talked about as soon as possible before anger starts build, don't allow them to linger. Be truthful about any concerns or problems that the two of you may be having. Keep the conversations calm but direct as you want to get your point across.
Explore your wild side to a degree, and take great note to this. While in the bed try new positions, explore some fantasies, and have fun. No matter the age let your youth come out full form. Find out what your partner has always wanted to and discuss if these a mutual feeling. As always try not to make your partner feel uncomfortable.
With anything in life all of this means nothing if you don't execute. One of the best saying I've been told in regards to improving relationships is this, "what you won't do there is someone out there that will". We should treat our relationships as a small business or investment, always trying to make them grow. Each of the five ideas above are relationship basics, but you have to be willing to work at it.