I'm a christian and I'm 15. I recently went online to look at women's body parts. I didn't do for the same reason as porn. I just wanted to know how it all works. Even so, I was a little sexually excited but I suppressed it. Have I sinned?

It's normal to be turned on by pictures like that, after all it's the way you were made. Men are very visually stimulated. Curiosity is also normal, if you haven't gotten enough information at home than it's normal to try and find that info somewhere else. Isn't there someone you could talk to though. It's a lot less tempting or stimulating if you have someone else that's holding you accountable. Careful that you don't get sucked into porn. It's pretty addictive and it can ruin you're future relationships.

I would say definitely not.  It is that just you are inquisitve and that is good.  Of course as males, especially as teens, we get excited.  That is something that happens, thanks to our hormones, that God gave us.  Females experience a lot of the same things, maybe not as strongly, yet they still do.  But it is a lot of what you do with it.  By that I mean for example Doctors have to look and know about a variety of things about us.  Male doctors examine female patients and female doctors examine male patients and do you believe they don't get a little sexually excited at times?  They do.  But they control it and move on to the next patient.  But like Dr. Luke, they are trying to help their patients and so they have to learn how male and female body parts work, what is normal and what is abnormal, for example.  So again, no you have not sinned, it is just curiosity, coupled with normal male hormones, and that is good.