lately i've been trying to extend my cum time so i've been watching porn and doing the start stop method. I will occasionally do some pc muscle flexing during the day when i remember to but i'm not exactly training hard. Earlier i decided to see if i could flex my pc muscle and masturbate simultaneously and not cum for longer than normal. After watching a movie and stop starting several times i flexed the pc muscle and pumped it. Almost instantly it made me cum. Any thoughts?