Retrograde ejaculation, or ejaculating backwards, in to the bladder, also has implications for fertility and is a common problem following prostatectomy – and also with diabetes.
Occasionally, during masturbation, a young male prisoner will try to prevent anyone else from seeing that they’ve been masturbating, by putting their finger or thumb over the external urethral orifice. This stops external ejaculation and sends the ejaculate backwards into the bladder.
If would be safer to ejaculate into a tissue – or admit to what they’ve been doing. They won’t be the only inmate to masturbate !