Going back to relive your high school days would be a dream come true, but i Don't think I would give up sex. Besides, he can't even be sure thats what really got him killed.

I can think of many better ways to change the past instead of staying a virgin forever. For starters, he should just stop being friends with that guy. That guy is oviously a nutjob, so it would be best to remove yorself from his pressence right away. If your not around him, then maybe he wont be so envious. Its not the main guys fault that the friend is creepy and girls avoid him.

my favorite way to change the past is to just kill the creepy friend. That solves the whole problem.

Also, i dont really think the main guy is dead, hes just probably unconcious in the hospital.

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Jeffrey

It's not like sex was fulfilling for the guy anyway, he just did it like anything else, remember that the mental state of this guy is a man that has already had many relationships with women, he isn't really missing out if he has already done it.

There are many ways that he could avoid getting killed, he could just cut all ties to anyone that he knows from the future.

I really want to see him use his knowledge of the future to it's advantages, like Biff from Back to the future 2, it's such a good movie

It's not about sex, the issue was that going after sex was preventing him from loving people properly, he only took advantage of them.
Loving someone truthfully is when you act against your desires for their sake.
So if sex was part of making someone else happy, it's okay, but if it's just to satisfy our own selfishness or as aim for itself then no.
It's clearly that when he cared about her even thought he know she's not for him is the proof of a form of love he didn't know of before.
Is it unconditional love?

"my favorite way to change the past is to just kill the creepy friend. That solves the whole problem."
I find it creepy that someone is thinking like that, so it's okay to kill someone when they are younger to change the future?
also the definition of "creepy" is just people's impression, but you can't trust people's impression, people get mislead by popular persons with a superficial positive image and avoid who they deep to be creeps, but in the end they get taken advantage by these society predators