In 10 years as a sex therapist and 20 years as a marital therapist, I've had gobs of complaints from women whose partners were too big for comfortable sex. I've only had 2 in 20 years about her partner being too small. The first woman had a vaginal laxity after childbirth (previously, he had been "just right" and the second woman had marvelous orgasms with the small man but had a mental block.
4 - Use a moisturizer on the penis before the exercises and it is preferred not to use soap and shampoo as these materials will lead to redness and irritation of the penis skin . If it stays for a long period of time, in addition to dry skin, and the occurrence of cracks, it is preferred to use the Intensive Care Vaseline instead of the ordinary Vaseline as it can stay on the skin for long period of time without irritating or damaging the skin of the penis.