Hi, Usually, females don’t reach Orgasm during Vaginal Penetration. Females do not reach Climax by inserting Big penis, fingers or vibrators inside the vagina, since walls of the vagina are practical without nerves, although few sensory nerves close to the entrance of the vagina. Inserting big objects inside the vagina will have no use, since no erotic nerve supply inside the vagina. Deep Vaginal penetration in men’s Fantasy, it is not sexual need for women Only occasional vaginal insertion that to only for few females will cause erotic feeling. Few Female prefer pressure on the whole vaginal region with rhythmic pressure which affects clitoris, labia minora and majora or direct clitoris manipulation. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. S.R.Raveendran, Sexologist