I (15 years old) would like to send my boyfriend a sexy photo of myself. I am topless in the picture with no bra. My girl friends say that I should not do it. Is there a reason not to?

Lots of girls and boys would like to make their partners happy.
They would like to look sexy for them.
However, there are a few things you should be aware of.

Clearly: you should think about who you are sending this type of picture to.
It is a very private thing and shows that you have full trust in your partner.
You should also ask yourself:
Does your partner want the picture?
You may not send somebody a picture who does not want to have it.
It could be a criminal offence.

Please consider:
This is your picture; you may decide who can see it and who cannot.
After you have sent it you cannot be certain what will happen to the photo.
Think carefully: can you trust the person to whom you are sending the photo?
Nobody may send your picture to anybody else without your permission.
If somebody violates this trust then they are at fault.
If you need more help with this issue then you can make contact with somebody here:
http://www.nina-info.de/save-me-online/kontakt-beratung.html