is watching porn and masturbates bad for health in any kind?

above applies for masturbation only or for sex too?

can i control the ejaculation until i wants,is it possible? i m male

thank you so much i was afraid because of it (:

is prone masturbation unhealthy?

refrence; http://healthystrokes.com/

Should I need any sex toy?

i do prone masturbation

as i see in porn that a girl desires a lot the cock and enjoying it a lot and i wants to extend that sexy/fuck time,as i experienced before that when i ejaculate suddenly then i was not satisfied fully and irritated too because of ejaculation was under in some minutes or in even under seconds i dont...

i am wondering that how to Cum When *I* Want To,for now i control ejaculation a little bit as per as i can with the following of "start and stop" rule(i read it at google) but after some stops i ejaculated automatically,i seen mens at porn that they r able to fuck until they wants for 40 m...