Our expert says:
Hi Mary-Jo, if you have tracked the forum, you will see that this is a common concern you have. Yes, the anus was designed as an 'exit point', and achieving penetration can therefore be painful if not done gently, with care, and slowly.
Becasue the lining of the rectum is thin, and not self-lubricating, vigorous thrusting or inserting sharp objects can tear the rectum, so care and plenty of lubrication is used to prevent this (and hopefully sharp objects NOT inserted). The lining of the intestine is also designed for maximum absorbtion, so if the person penetrating has any infection, it will be easily be absorbed if no protection is used. It is also important to replace a condom (or wash the penis) after anal penetration and before vaginal penetration because the bacteria in the rectum can result in vaginal infection. Absorption of the ejaculate is not problematic, again, as long as your partner is STI free. It might just feel a little peculiar as it exits!
As for the reasons why some men find it exciting, I think this can relate to several factors: it is seen as 'forbidden' and therefore having a partner allow it can be exhilarating; because of the tightness of the anus, it may provide more friction/different sensation to vaginal penetration; some men like the look of their partner from behind as a novel and exciting (?domineering) position.
Women describe being excited by the idea of doing this for their partner, and also the feeling of fullness.
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