I've always been interested in mind/body healing. Although I have no experience in the area you are mentioning - here are three examples of the body changing which are quote unquote impossible.
#1 - A girlfriend enlarged her breasts through visualization/hypnosis
#2 - I got rid of a scar on my chin which a dermatologist told me only plastic surgery would remove- it took me about 6 months to accomplish
#3 - I had an infection around one tooth and lost some bone - I regrew new bone -and I have the before and after x-rays to prove it-my dentist doesn't know what to make of it
From what I've read - (Jose Silva material) you have to be in an alpha state to create the changes - you can't do it in your regular waking state. Hope that's helpful.
rachel
p.s. - I disagree with you , that larger increases a woman's psychological satisfaction, maybe physical (depends on the woman)