I thought I'd briefly discuss why this is such a wealthy practice, this Karezza.
I think I always lived in the past with my beloved with a state of lack, a state of fear of not getting enough sex. Fear that I wouldn't have an erection, or that it wouldn't last.
I know a lot of guys who feel the same way and they live that way.
When we had sex, it was to reach an orgasm or else it wasn't a success. When the orgasm was over, it was over. And as time went by, my beloved got more ordinary looking and I continued feeling that lack and that sense of anxiety.