Does quick ejaculation cause a lazy and low sperm count? -
No, I highly doubt quick ejaculation causes a low sperm count/lazy sperm. You produce a couple million sperm a day while you can only ejaculate so many times a day without your body being unable to produce a liquid to accompany to the orgasm. Sperm are created quite quickly and by the time they are emitted during ejaculation, most of the time they are fully developed.
Pre-ejaculation or Quick Ejaculation is a matter of control while Low sperm count/lazy sperm has to do with the development of the sperm while in the testicles. Both are preventable unless there is some genetic disease or contracted disease in which your sperm are deformed. Either way, you can take steps to improve both.
Premature Ejaculation is much easier cured than Low Sperm count/Lazy sperm. I highly doubt their intertwined, as someone can impregnate a woman by releasing much earlier than expected and someone who can control themselves better can have a Low Sperm count. If you want, you can do more research on both subjects and find out if they are potentially related in any manner. Talking to your General Practitioner or Urologist will clear this up and they will give you thorough and in-depth answers. Hope this helps.
I don-t believe it-s the quickness, it-s how much is ejaculated (although there are also other reasons for low sperm counts / lazy sperm).