Erotic Compilation

 

Never Enough

Manual stimulation of the genital organs (of yourself or another) for sexual pleasure.

For that matter, you can consider any form of sexual activity as masturbation, whether you do it solo or with other people, same sex or different. Basically, if you aren't doing it for procreation, and even if you are, you are masturbating to achieve an orgasm, with or without semen being involved. At least, that's what I believe and I don't consider it a negative viewpoint either. I suppose it's rather clinical. 

But don't you think some of the highly clinical terms can be rather erotic? Personally I find referring to your penis is more interesting than saying cock, which is kind of cold and I definitely don't like dick or wang. Boner is better and erection is sexy at least to me, and swollen manhood is hot.