The Arabic proverb says :: "Woman prefers additional centimeter in man's penis to any thing that this world can give." The average size of penis is 15 cm. According to statistical research 90% of the men have size from 13 to 18 cm and it is considered normally. The extension of penis size is a cherished dream of many men. Today it is real with the help of different methods (i.e. creams, medicaments, sex toys, etc.).
You can choose between :: two ways of stimulating the prostate yourself. The first way is external - through perineum between testicles and anus. The second way is internal - through your anus. It could be quite difficult if you aren't lithe. Usually, the best position is when you are lying on your back, the knees are bended, foots are on the bed or they are pressed to your breast. In such position you can insert lubricated finger in your anus, bend it and find by feeling the prostate. Remember that fingernails should be cut shortly. In the depth of the prostate, about 3-5 cm, you will feel a small walnut sized lump on the front side of the rectum. Rub it carefully back and forth. You can also insert it and take out with different rhythm. Such movements stimulate highly sensitive nerves in anus region. If you don't want deep penetration you can stimulate only anal sphincter or perineum, it stimulates the prostate indirect. Such stimulation is much more intensive and deep. In such case it is harder to control the degree of arousal than during the stimulation of genitals. So don't hurry. Instead of the finger you can use prostate massager. It is more comfortable. Besides, all additional settings of such massagers bring real pleasure.
Gentleness, adequate lubrication :: and anal relaxation are required for anal sex! If condoms are used for penile penetration, which is advisable to reduce the risk of sexually transmitted disease, it is important to use water based anal lubricant. The man should control his thrusting, so as to give the partner time to allow their sphincter to relax. This will become easier with time and practice. Some anal lubricants contain a desensitizer to make the anal play more comfortable. Since the anal region is not self lubricating, anal lubricants are very helpful for making anal penetration more comfortable and more pleasurable. Anal sex should not hurt. If it hurts, somebody does it wrong. With enough lubricant and enough patience, it's possible to enjoy anal sex. However, some people may never like it. If your lover is one of those people, respect their views. Don't force the idea upon them!