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I'm hoping you are referring to 'autoeroticism,' and that the question rightly asks, "What is the effect of autoeroticism on male bodies?" I spite of centuries of disparagement, the practice of masturbation remains a normal and naturally self discovered method of sexual learning and appreciation. If all of the studies of the supposed harm resulting from the habit were piled up, no one person could read them in a lifetime. Yet the self amusement and enjoyment continues unabated. Physicians tried to quell the practise in the mid 1860s by introducing circumcision to the USA. Although that surgery on 2-4 day old males has been proven to dampen the sexual enjoyment of masturbation, it certainly did not slow the number of pubescent teen males satisfying themselves in this manner. No proven disadvantages have ever been ascribed to masturbation. It remains a safe, enjoyable method of self introduction to the world of sexual adventure.

Yes, it's called autoeroticism, or more commonly known as self masturbation.

Which is when one stimulates them self sexually.

It is perfectly normal, healthy, and safe.

Yes, a person can engage in homo-sexual activities with themselves, known as autoeroticism or self-stimulation. This can involve masturbation or other forms of self-pleasure.

The term "autoeroticism" refers to behaviors designed to obtain sexual satisfactionwithout the intervention of another person (the most obvious example being masturbation-1). However, the term is often understood more broadly, given the Freudian conception of psycho-sexuality, according to which many different physical pleasures take on the value of sexual satisfaction. Genitals are not necessarily involved. By extension, the same can be said of certain psychic activities (reading, according to popular wisdom, is a "solitary vice"). "Alloeroticism," a less common term, refers by contrast to sexual satisfaction obtained with the help of another person.