You are who you are.

You cannot turn a lamb into a tiger. True, you can modify some of your can stop drinking, smoking, doing drugs etc. Good for your health and your wallet and it takes a good deal of discipline to achieve. But while some women ("nymphos") can be quite agressive sexually and jump on everything, other women are rather saints and stay virgins pretty much forever. Some guys can "do" both the husband and wife in the comfort of their home...while other guys could not accept the offer of a gorgeous woman even on a silver plate. It is always a matter of being comfortable in a situation....or not. Sometimes it is said that you should try to do things outside your comfort zone. True and why not. But that will not change the basic fact of you basic "DNA"