pumping the perenium to hold ejeculation and increase volume and throw

hi
i realy like pumping the perenium. this helps control the ejeculation. it prolongs the ejeculation time and also the velocity of the ejaculte. i release the pressure after orgasming and then the spermatagone shoots and goes far away with pressure ... doing so the volume of ejaculate is much large.


so my question is , is any one doing so ? done so ?
and what are the negative affects of it .. ?


i use a small cup which are used in cupping therapy..