Well you say that you are happily married and that you have a great sex life with your wife. So, if I were you, I would NEVER cheat on her just for those reasons alone. Also keep in mind that you will be breaking your marriage vows that you made to your wife in a church and there is no going back from that once you do it for the first time.
However, this is your life and if you decide to cheat on your wife that is your decision. But I will at least attempt to give you some links which will show you what is extremely unsafe to do when having both oral and anal sex with another man. Not only the first time, but also for every time after that too.
Is It Dangerous or Painful to Have Anal Sex?
HPV Linked to Throat Cancer
How to Perform Safer Oral Sex - Precautions