Firstly, that isn’t edging. oratam is right.
2-What exactly do they mean by saying: stoping flow of semen. How?
You may squeeze the glans, that will do it also.
Or you may stop with “multi orgasmic man technique” which is to do a though-long kegel in the middle of orgasm to subpress ejaculation. Which I probably did 100 times by now. Nothing bad happened.
In any case, the sperm isn’t going to the urinary bladder. In case 1, sperm will go out the normal way when you stop sequeeze, in case 2, it goes back to the balls.
whoever wrote that article, wrote a wrong thing in my opinion.
Good luck!
Start: 6.9 BPEL x 4.9 (17,5 x 12,5 cm)
Now: 7.7 BPEL x 5.7 (19,5 x 14,5 cm)