My experience - kegels exercises helped me in delaying ejaculation. But doing kegels during sex made me cum.
About 2 weeks ago I read about reverse kegels and eureka! I tried it and it fking works.
Believe it or not, doing reverse kegs during sex can postpone my ejaculation to another session.
One thing I realized is reverse kegels desensitized your penis so do it only when you feel you might cum, else you won’t enjoy the sex.