I think it comes from lack of sex education.
As a mom-to-be, i spend alot of time on a pregnancy app and see a lot of parenting opinions about teens and sex. Most either don't want their "babies" to know about sex or even know how to prevent pregnancies other than abstinence and we all know how well telling a teenager NOT to do something works. They have sex anyway and don't know how to protect themselves.
Not sure if its true, but I saw a post one day about a 12 year old who got his gf pregnant (twins too). Sad thing is there was another post with asking if 12, 13, or 14 year olds should have access to condoms...Majority voted "No, they shouldnt even be having sex at that age." While true they shouldnt be having sex, they will and need to know how to protect themselves.
I also think it comes down to the image of being a parent. I've heard stories of teens actually trying to have a kid. I'm not sure why any teen would want that. Taking care of a kid is a lot of work for someone still in high school.
Apparently my mom and dad "planned" me. Im not sure how true this is, but they were still in high school and it almost made me ashamed that they would even try something like that.
Okay..i think im done..im pretty opinionated when it comes to teen pregnancy. I know when my daughter is a teen we will talk to her about safe sex. Because you can't stop them from having sex. But you can make sure they are being safe. (or at least you have a better chance trying to get them to be safe then to not have sex at all)