I would encourage young men to put off marriage until they've gotten through most of the adventures an unattached young man might want to take, romantic or otherwise. That's the most important thing. If you don't, you'll resent whoever you find yourself with.
It goes without saying, but you need to find a woman that you deeply, deeply love, but who is also deeply, deeply in love with you. You shouldn't feel lonely in her presence. Find a woman who you can talk to about at least some of the dark stuff swirling around in your head, who you can be halfway candid with about your drives and desires. If you feel suicidal self-loathing if you don't have a particular kind of sex four times a week, you better let her know that. Good. Now, have a kid. Have another one. Give them attention. Give her attention. Keep your head above water. Figure out constructive ways to alleviate desperation, to feel slightly happier, and to calm your resentment and self-loathing (so, not pornography, not dope, not dope, and not trying to sleep with strangers and friends). Make friendships with good men. Join a twelve-step program or volunteer for church stuff, if you can't make friends. Take time to sincerely evaluate some of the seemingly braindead, faggoty advice that successfully married people and mental health professionals give you. If you don't live near her parents or yours, find a reliable babysitter.
After all that, you're still going to want to sleep with many of the pretty young women you encounter. But it will be for healthy, manageable reasons. Your extramarital affairs should be compelled by something more romantic than self-loathing and pornography addiction.