Should I stop my friend from getting laid?
I hope you are joking. Why do you want to keep your friend from having sex?
I think sex is dangerous.
You are right that there are some dangers in having sex, especially unprotected sex, but you shouldn't get involved with your friend's sex life. They are free to make their own choices and live how they want to. If you try to control them, they will resent you and not want to be friends with you anymore.
I get what you're saying, but I have a plan to prevent him from having sex. I'm going to switch out the condom for a plastic banana.
Because humans tend to be sexual beings, I am not sure if you can stop your friend from having sex. The urge is strong, and you shouldn't control what others want to do. Friends don't always agree on things but they can still have a great bond.