One thing i've always wondered on this topic is when is it ever safe to have unprotected P in V sex? say hypothetically you're with one partner, you've both gotten tested and are clean, you take birth control, is it still really unsafe to have sex without a condom? because I understand that there's certain diseases that aren't tested and one may still have a risk of transmitting them, and some that condoms don't protect against. Just curious, what would be ideal circumstances to have unprotected sex? never? cos there's always level of some risk?