The Centers for Disease Control recommends STI/STD testing any time you have had new or multiple sex partners. There are four types of sex that can put you at risk for contracting an STI: mutual masturbation, oral sex, vaginal sex and anal sex. Many infections may not cause symptoms but can still be passed between partners. Also remember that while condoms may reduce the risk of getting pregnant or contracting an STI/STD, even if used consistently and correctly each and every time, they cannot provide 100% protection.