Healthy Sex Support Group
This community is dedicated to an open discussion about healthy sex and sharing thoughts and feelings about sexuality and improving one's sex life. Most active adults desire to have an active and fulfilling sex life, both for themselves and also their partner. Here we discuss common sexual challenges faced by both men and women.

I use condoms every time. And I'm on bc but that's mostly for horrendous periods.
You can go to a women's clinic or your doctor and get more info. Dental dames and condoms can be purchased in stores but finding dental dams is harder to find in brick and mortar retailers. Your best bet is at a clinic that screens for std's or to buy them online.
Only celibacy keeps you 100% safe and not many people are willing to do that. I know I'm not. I'm single. I meet guys and have sex but always with condoms. No condom, no sex. It's non negotiable with me.
Get tested regularly. Not sure how often it is recommended to be tested but if you are sexually active with more than one person, probably every few months. Probably less in a committed monogamous relationship or monogamous marriage but everyone should be tested from time to time.