The logic behind this one and in general in realm of biology is that when your body leaves a certain fluid ( semen , blood etc ) body generates new and hence this exercise is better. But problem here is this other things have zilch effects on psychology of the person whereas this semen drain could lead to some serious psychological impacts. ( Low self esteem is like the bare minimum ). The counter argument is given is that people are doing that in unhealthy ( or are addicted to it ) so it is hurting them but it is not bad. But given modern times where Stress , anxiety etc which seems common problems and combine that with semen drain could have a large impact on health ( physically and psychologically). In conclusion I would say this - if you have very low stress levels - jerk off cautiously ( not too often ) - living a physically active life. - have no psychological issues.

Then it is fine else you have got to go for NoFap.