sex is like food you can go a little while without it but eventually you have to have it.otherwise u can go crazy and just do dumb shit u wouldnt think of doing.
I wouldn't say that I have to have it. But I wouldn't say I could do without it like it wouldn't bother me if I haven't had it in awhile. It's healthy, it's fun, it's a good form of working out, and it's definatly a pleasurable experience.
I don't think people who treat it casually can really understand what a great thing it can be in a spiritual marriage, which is why any perversion of marriage grates on me.
It's an elaborate web of things that makes for good sex.
You need to be in good, preferably great shape, you need to have the right partner, the right mood, the right place, the right time.
And of course you can't account for all of the horrible things that can happen.
Honest advice: practice makes perfect.