redrocker said however they play unsafe. I'm not sure how I feal about it having unsafe sex. I play safe. I'm very uneasy about the topic when they bring it up when we go out.
It's amazing that a 24 year old who lives in the SF area could be as naive about safe sex as your question implies.
To be positive, go for the sex - it could be hot - just use protection.
Unsafe sex with two guys is about the same as having unsafe sex with just one guy, except your odds of catching something are twice as great.
You mention that they "bring it up" when you go out with them. What did they "bring up?" That they are unsafe together, or that they want to have unprotected sex with you? If you want to stay healthy, let them know that they would have to play safe with you at least. Or you will be taking your chances - like playing russian roulette.
Even if they have tested negative, they could have caught HIV after their last test, and it takes a while after the virus is in the body before the antibody test shows up positive.
Even if you started taking PREP, you could still catch hepatitis, syphilis, or an almost incurable strain of gonorrhea.