In the old days we used condoms, not to get the girls pregnant. We have no clue about STD.
Later, condoms are used more for STD protection, pills being availabale.
When to use a condom ?
I have one super nice ebony, that was using condoms only for anal. Hmm
Reality check
In oral, the teeth of a woman do scrath your dick 100 times more than when you are in her pussy or ass.
STD get to you and her from body fluids.
So, if you like a hunck, or a super sexy girl, in a bar/disco, and you see her/him coming from the toilet or bunnies, put a condom on.
When you know the person better, and want a longer relationship ask him/her for a blood STD test, herpes included.
There are people alergic to latex, there are options.
So have fun, fun , fun, fuck, suck, nipp with all your hart.
And enjoy the natural juice