In general, yes. In fact it begins to fall off around 18.
No. It is proven that marijuana decrease sperm count, but it is a very light decrease, over long periods of time.
Alcohal and tobacco consumption will decrease the blood circulation. It will resulting the low sperm / egg production.
A varicocele doesn't decrease semen per se, but it does decrease sperm count, and if left long enough can predispose to testicular cancer. When a person has a varicocele their testicles are kept at too high a temperature and this is not good for the sperm or the testicles.
Habitual use lowers sperm count and causes a decrease in sexdrive for men.
It can decrease the sperm count, hence reducing the chances of fertilizing an egg.
The tight boxers aren't to blame. Sperm are killed in the presence of high temperatures; that's why the testicles dangle down - to keep sperm cool. Tight clothing and hot baths can both reduce sperm motility. This is not to say that a jacuzzi is an reliable method of birth control; it isn't.
Yes, marijuana, alcohol abuse, cigarettes and some drugs can effect not only your sperm count but also the health (motility) of the sperm.
Condoms do not lower sperm count.
20% decrease.
The count is made if you have enough sperm to fertalise a women, sperm comes out with the semen.
You most certainly can, sperm count has nothing to do with it.
No mustard will not lower sperm count at all.