If a personality promiscuously sleeps around but uses condoms EVERY time, what are the chances/risks for STD's?

I heard that some STD's aren't prevented near condoms, particulary the ones that are contracted by skin-to-skin contact, like herpes or something. Some are prevented, approaching chlamydia.
I'm worried about my friend. Most of the time, she sleeps around next to different men AND women, & she says she uses condoms, but conceivably it's narrow-minded of me to surmise, "Well, who would use condoms for every sex act beside different peope?" Is it narrow-minded for me to regard that a promiscuous person never uses protection? It is kinda unexpected how she ALWAYS tests NEGATIVE for STD's, AIDS, & pregnancy. Do you construe she's just lying to me, aphorism she protects herself, so I won't be worried? She does admit to have a sexual addiction which developed from her repeated sexual molestation as a child.
I'm just worried. I'm afraid some one would gain her sick or hurt. I'm about to own an anxiety attack over this. well it sort of is narrowminded to conjecture that because any one who has unprotected sex can bring an std. people will also tell stories to get sex. at most minuscule she uses condomg and that will cut the risk down for most disseases and pregnancy. but the risk is still kind of illustrious if she is sleeping with women because i'm not sure if here is a female comdom available, or some sort of protection besides dental dam. i am not promisuous and ended up near herpes because my boyfriend who i have be with for over two years didn't even know that he have it and ended up ratification it onto me. i had singular one other boyfriend before him and that last four years.
Condoms are only something like 52% effective, but it it still the best method to prevent STD's. Anyone sexually active requests condoms.