Hmmm ok so yes sex without a condom will feel better but,
Herpes 1&2; treated/controlled with anitvirals valcyclovir, acyclovir but both have potentially nasty side effects & can cause organ damage
Syphilis, gonorrhoea, chlamydia, trichomonais can all be treated with antibiotics but again you're looking at nasty side effects and helping breed resistant strains by taking them often. Plus Syphilis tests aren't even very effective in finding the virus. Lots of false negatives in the early & late stages..
Antibiotic resistant Super Gonorrhoea; the problem with treating this infection is self explanatory in the name lol
HPV; well we have a very risky Gardasil vaccine for this but is the risk worth it? I personally wouldn't take that shot for a million dollars.
Hepatitis A,B,C; well we have vaccines for A&B but they aren't 100% effective either there's a problem with a high rate of non-reaction with the Hep Twinrix vaccine (approx 10%)..& they don't last forever. Vaccines lose their effectiveness at different rates depending on the person & it's not like your body's going to send you a text or email to let you know you're not immune anymore.
Hep C is mostly a risk when sharing needles or bareback greek...so you don't have a high chance of catching it simply through unprotected vaginal sex..I think that's the only good news on my list lol.
I can just imagine what collection of nasty side effects an HIV-preventative drug will come with. Theres no such thing as a magic pill or magic shot.
Anytime you're in a non-monogamous relationship the trade off is that you really should use condoms (other than with your primary partner)
Plus theres the baby momma drama BC Babe already mentioned...