There is no harm in "releasing his sperms by himself"(masturbating) as much as he wants or as little as he wants.
The problem occurs when the guy worries about it, either because he thinks he is not masturbating enough or thinks he is masturbating too much. Worrying will cause headaches. After his "sperms get released", his whole body should feel relaxed. If headaches continue he must tell the dr.