Jesus could have masturbated, you don’t know that he didn’t.
Since Jesus was fully human, I guarantee that he did, so what?
I’d say the answer is Intimacy. Masturbation is missing a whole lot of the psychological stuff that makes sex fun. That said, I too agree with Otto, sex isn’t always better.
It’s kinda nice sometimes not having to worry about pregnancy or STDs nisosbar.
My WAG-
Evolution.
If masturbation were equally or more pleasurable than sex with another person, our ancestors would have no reason to seek out a mate and would not produce offspring.
It is not so much like a chore. When I have sex WITH someone I am not so focused on what I am getting out of it.
Should we assume that if Jesus Christ didn’t masterbate, that he had wet dreams?
There are a lot of jokes in there somewhere…
True, sex is not always more pleasurable than masturbation, but in general, I’d take a good co-ed pairs naked-time over a solo excursion anyday. The do-it-yourself version, while it achieves the intended goal, is just different. Personally (very personal TMI on the way), I just love the feeling of intercourse. There is just nothing like the sensation of having a penis in there. Vibrators and such are great, but it’s just not the same.
I need to stop thinking about this now. 
Reading the OP it appears the person already said that masturbation is better, ‘can give ourselves a better orgasm with Rosy Palm’, but wanted to know why sex was better with a partner, not which way is better. Those saying that masturbation is better are just repeating what the OP already said. Of course, all that snuggling is nice.
Relations with a partner is always better IMHO, owing to the emotional involvement before, and after.
When your partner is not available, self-love enables you to be director of a mental fantasy. If it’s sublime, fine. If it would make Fellini blush, also fine.
Your mind, your privates, your soap. Wash as long and as fast as you please.
I may be unusual but for me sex with someone I don’t know or don’t have a connection with is not much better than masturbation. On a couple of occasions I’ve had the opportunity to have a “sure thing” with someone I did not know very well or at all. All I could think of after getting to approximately 2nd base is that I really did not want to be there with her. So I made some excuse up and left. Now if it is someone I really care about and want to be with, then it is the best thing in the world. Otherwise I’d just as soon masturbate. It’s quicker, then I can go on to other things.
I’ve always thought it’s just the human contact. To be perfectly honest I don’t masturbate unless I am so insanely horny and am single that it drives me to distraction that I don’t. (Seriously, I get some of the weirdest dreams when I’m horny and single and maybe 1 out of 5 actually go somewhere and don’t leave me feeling more frustrated when I wake up then I was when I went to sleep)
Masturbation is a release, sex is a sharing and a coming together. The sharing can be more intense.
I think its more fulfilling to have sex because of the emotional and physical side of it.
For some its satisfying to know you pleased the partner.
So if Jesus masturbated did he also…you know…
Brings new meaning to the term, “baby Jesus.”
Whenever I masturbate, I try to use someone else’s hand.
On top of the emotional and psychic experience of being touched by someone else, never underestimate the power of foreplay. Yeah, I’m pretty flexible, but I still can’t kiss my own neck (or any number of other places).
As much as I enjoy my own company, I can enjoy the fine art of foreplay, and post-play, with a known and cherished partner. There are arguments for both formats, and the intimacy, foreplay, and general joy of a partner are all telling arguments for sharing.
However, I have no qualms about making certain my own needs are met. Just as well, as the beau is effectively married to his shop.
It’s not. I’d agree with Verminous in disagreeing with this thread’s premise, at least in my experience. Sex with other people would be a lot more satisfying if it didn’t involve other people.
I was not quite picturing the neck 
Sure. On the bus, at the ball game, during parent-teacher conferences…
Re the “never masturbates” side discussion, count me as a guy who never masturbated to orgasm until after I had lost my virginity. The first time I climaxed, I was, er, inside the first woman I was with. A total mind-blower, because I had no idea what to expect.
After, that, of course, I made a point of developing the skill.
Folded tissue? A real man needs a parachute-sized drop cloth.