Is it possible to stop sexual arousal by thinking about sinning?

Whatever works!: I would think that would have the opposite effect. But if it works for you, go for it!

Embrace who you are: The only way to get a handle on your sexuality is to keep it in perspective. All young men and many young women enjoy their bodies to keep the pressure down. Most mainstream faiths consider this healthy. Think about that one special person in your future, and why it might be good to focus on study / work for now and save the best for your wedding night with someone you truly love.