My boyfriend and I had anal sex. We didn’t use a condom and he didn’t ejaculate in me…

…Neither of us have been sexually active with anybody else—is there any possible way something might happen?

Great question!  In order to get an infection, a person has to come into contact with someone who is already infected. If neither of you have been sexually active before, it’s unlikely that an infection could have spread between you. However, in the future it’s a great idea to wear a condom anyway. Being in the habit of wearing a condom will make it easier to stay safe and healthy with future partners. It’s your health!

Because the anal tissues are very delicate, there is a small risk of anal fissures from this type of intercourse.  For some health tips related to anal sex, check out this question.