Yes, you can contract any variety of STI’s from anal sex. Unfortunately, because it’s not possible to get pregnant through anal sex, men and women alike make the mistake of thinking that they are “protected” during anal sex. The only protection you may have is against pregnancy. Unprotected sex means unsafe sex.
Have your partner wear a condom no matter which “door” you’re using. It’s your responsibility to prevent the risk of herpes, HPV, syphilis and HIV transmission. Take charge.