Relatively few cats are happy being touched here though many can be gradually accustomed to having these areas touched or stroked. Once again, it's up to the owner and the cat to work out between them what feels good. If the cat decides that one part of its body, e.g. the belly or backs of the legs, is a no-go area, then you must respect that. I've never worked out why, but it's something she loves and she will lie flat out for ffive or ten minutes for this. If I forget, or I try to skip the mouth massage, she grabs my hand and sucks my finger against the roof of her mouth to remind me.
Some cats enjoy a massage so much that they ask for one if they feel low.
Dr Michael Fox's cat Sam asks for a hindquarter massage to relieve the muscular discomfort associated with his occasional bouts of cystitis. He knows it makes him feel better. Scrapper liked me to soothe away the pins and needles associated with old age and worsening circulation. Sappho and Affy loved tummy rubs. Sappho developed a bowel problem and the belly rub probably made her feel good.