Q: what happens to the body when you use to have sex and you don't any more what things the body go throuh
Well, besides potential emotional frustration, not very much. If you continue to masturbate, especially if a woman masturbates with a dildo, to exercise the vaginal muscles similarly to penile insertion, nothing much is going to change, as far as I know.
If you don't masturbate? I shudder to think of a life with NO orgasms … but scientific studies have suggested that for men, regular ejaculation can help reduce the risk of prostate cancer. The neurochemical reactions to orgasm can also help alleviate depression, improve overall mood, and possibly even boost the immune system.
That said, a lot of religious and spiritual groups have long histories of associating complete sexual abstinence with spiritual enlightenment, and a good many ascetics of this sort live to ripe old ages. Probably more to do with the fact that they also do not drink or drug, or eat to excess, than with a lack of sexual pleasure though.