The only way to have sex is the natural way and I should add that into this thread too. Its unnatural to put shyt on your meat, or foreign shyt inside a woman, in the act of intercourse.
The best ways to avoid STIs is thru 1, abstinence, abd 2, keeping your dikk clean, maintained, and not just fukking everything you can. For a woman, keeping that cat clean and well maintained and not smashing everything.
Abstinence is the very best practice but minus abstinence, you just take care of your shyt. Sex is meant to be natural.
Man I know what you mean. My youngest daughter's mom is certainly in the running. Its hard to describe, that puss is touched by god or something