A man who's having an affair will almost always leave signs that you can pick up. He may spend more time working on his appearance and on his computer, spend money he can't account for and seem distant and distracted when he's with you.
If you had to describe the physical appearance of somebody you just met from memory, could you do it easily. You may have trouble remembering faces, but recalling the brief silhouette and hairstyle are probably what you can still manage.
Vaginal sex intercourse involves inserting the penis into the vagina. Some sexual activities are riskier than others for getting or transmitting HIV. Activities like oral sex, touching, and kissing carry little to no risk for getting or transmitting HIV.