My 5-yr old son had his first sleepover with another 5-yr old boy that he's known for 2-1/2 years. They are fond of each other even though they are very different children - he's a jock, wants to win everthing, "I won, I won" type, holds himself. My son more of the goofball, can't play ball, doesn't have a real quick wit, resorts to whining easily. After coming in from outside, while I was getting some pajamas from the laundry room, the two got stripped down in his room to change. I heard him say to his friend that they could "let their privates touch each other." On my way back to his room right at that time, I calmly said that we should keep our privates to ourselves. My son had an erection! The other boy was in his underwear saying that's what he was going to wear to bed. My son looked a little shameful when he took the pajamas from me, and wouldn't stand up. He was repeating himself that he just wanted underwear, just wanted underwear. I explained that it would be more appropriate to wear full pajamas right now, and they both agreed. I am in shock! I was on eggshells all night trying to convince myself my son is not a freak. It was the closest he's gotten to someone besides his father and me. It was his first glimpse at someone else's sort of intimate time/normal time. I got the feeling that the whole visit from his friend made him feel so special and loved and chosen. He has questioned the only child thing and recently started naming this person and that person his brother or sister, "I have a brother, his name is this" He doesn't have the experience of the other child in the house, no visibility of his mother or father caring for someone such as diapering, potty training, bathing. I am hopeful that it is a normal feeling of closeness that caused it, and not sexuality. Could he be gay? When I put them to bed, the underwear thing came up again and they change into them separately....and he got another erection that didn't seem to affect him at all. His friend didn't seem to notice anything strange, which was relieving to me. I saw it because I was watching for it - praying it wouldn't happen. I am trying to recall all the touching he's done in his life and I'm not sure he's had enough?! If he hasn't run the gammet of self-exploration as a toddler, will this continue and make him strange among friends and peers? Will it be easy for him to recognize sexuality and sex drive?