Through the entire history of the space age, through the countless hours, days, weeks, and months that astronauts and cosmonauts have spent in space, it seems plausible, even probable that an astronaut or cosmonaut has at least once succumbed to the desire for masturbatory (or sexual) gratification. However, orgasming in zero-gravity would seem to have certain complications, at least for men. After all, who wants weightless blobs of semen floating through the space ship, posing an aspiration danger, clogging up instruments, and being just plain icky? So has any astronaut or cosmonaut ever admitted to getting off in space? Have the various governments and space agencies advised their space travelers on what to do should the temptation arrise, such as strictly prohibiting masturbation under any circumstances, or requiring that it be done into a special container?
Also, wouldn’t it be so cool to say that you were the first guy to spank his monkey in outer space?
According to this page, a typical ejaculation is 2-5 ml at a speed of 200"/sec. Since momentum is conserved, a 5ml ejaculation results in the astronaut moving backward at 0.013"/sec (assuming 75kg mass for astronaut).