Some people say, when a female gives you the number of partners she's had, double or even triple it. I don't tell anyone my number anymore, not because it's high (it isn't), but because a) It's none of their business, and b) They probably won't believe me, anyway.

As long as you tell your partner if you have any known STDs or infections, and get tested regularly, and as long as you practice safe sex, they will have the information and protection to reduce their chances of getting infected.