Karezza is, basically engaging in sex without finishing; that is, no orgasm. It was originally proposed as a primitive form of birth control, but has also been cast as a way for couples having lost marital closeness getting back together. Basically, it's a prolonged sex session, but with the guy pulling out without comeing.
Among the things to do in karezza, according to some instructions, is:
1) Smiling, with eye contact
2) Gazing into each others eyes for several moments
3) Synchronised breathing
4) Cradling, or gently rocking, your partner’s head and torso
5) Holding, or spooning, each other in stillness for at least twenty minutes to a half-hour
6) Holding, or spooning, each other in stillness for at least twenty minutes to a half-hour
7) Wordless sounds of contentment and pleasure
8) Stroking, hugging and massaging with intent to comfort, rather than gain something
9) Lying with your ear over your partner’s heart and listening to his or her heartbeat for several moments
10) Touching and sucking of nipples/breasts
11) Gently placing your palm over your lover’s genitals with intent to comfort
12) Making time together at bedtime a priority, even if one partner has to get up and work on something afterward
I'm not sure that this is a good idea. It sounds like a strange form of kinkiness that probably crept out of California!