But from a standpoint of pleasure and sexual response, sexual anatomy is about far more than genitals and is far less about reproductive organs. Ultimately, all the parts of the body are potential or actual sexual organs in the context of pleasure, though some body parts or areas, overall, tend to play a bigger role for most people than other parts do. Our most important sexual organs when it comes to pleasure are not only usually different than we think, but operate far less independently than we assume or have been told. We're not saying the genitals aren't important or a big deal with sexual pleasure and experience: There are a lot of densely packed nerve endings in our genitals, and if and when we stimulate them ourselves, wantedly have them stimulated by others, or rub two sets together, it does tend to often result in a sexual kapowie.
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A lot of people, women especially, have less than ideal experiences in their first anal encounters, however, largely from inadequate preparation mental or physical. This often results in years of not wanting to try anything involving butt play again. If you get involved in some of the more elaborate activities like prostate play with a male, or fisting of the anus, other parts of the internal anatomy will be involved. Those will be discussed at the appropriate time, however. It exists primarily to keep you from shitting yourself.
Prostate massage Male genital anatomy, showing the location of the prostate with respect to the rectum The abundance of nerve endings in the anal region and rectum can make anal sex pleasurable for men or women. An Encyclopedia states that "the inner third of the anal canal is less sensitive to touch than the outer two-thirds, but is more sensitive to pressure" and that "the rectum is a curved tube about eight or nine inches long and has the capacity, like the anus, to expand". With its glans or body as a whole estimated to have around 8, sensory nerve endings,   the clitoris surrounds the vagina and urethra ,  and may have a similar connection with the anus. In pornography, anal sex is commonly portrayed as a desirable, painless routine that does not require personal lubricant ; this can result in couples performing anal sex without care, and men and women believing that it is unusual for women, as receptive partners, to find discomfort or pain instead of pleasure from the activity. Researchers say adequate application of a personal lubricant, relaxation, and communication between sexual partners are crucial to avoid pain or damage to the anus or rectum.