not meaning to blow my own horn but.......
this is easy to achieve, best way is to try it whilst masturbating. when u start u will need to stop near the vinegar stroke, a couple of weeks on you will be able to mastrurbate to orgasm without ejaculating. next step is to take it to bedroom, once again at the start you may need to stop prior to orgasm, but with practice it's a piece of cake to continue having sex (maybe with a momentary pause due to penis sensitivity) before during and after orgasm. best of all when u finally do want to cum it's a pretty impressive volume (i guess maybe not for the recipient, depending on where it lands!)
:-X