Chastity and orgasm denial discussion

I came across information about using numbing cream to reduce pleasure for men during sex, preventing them from ejaculating. Questions:

• Is the effect limited to the man? Does it affect the woman too?
• Is it truly effective at stopping ejaculation?
• Could you share more details or your personal experiences?

I haven't tried it myself, but I've read comments from people who have, and they suggest using a condom to prevent numbing the partner. Based on others' accounts, there is some trial and error involved in finding the right amount. Using too much can numb you so severely that maintaining an erection becomes difficult; using too little means you ejaculate normally. Some people even opt for double condoms because they still feel sufficient sensation otherwise.