yes alot. condoms are not individually tested only a few a box. it is better if a women took Birth Control pills. or maybe you or her could get fixed so you can never get pregnant
yes, it is. if you lose any sperms you must immediately reconsume them so that your body does not lose any more sperms. scoop them up and swallow them, try not to miss any.
Yes
Probably the same way as any other human is conceived. We are not told anything different in the Bible.
Use a condom.
It is possible - some sperms may be transferred during the early part of intercourse without any noticeable climax. It's always good to use a condom, both to avoid pregnancy and to prevent sexually transmitted diseases, but be warned that no method is 100% guarnateed.
You can't get pregnant unless the condom breaks or is used wrong. Not all condoms have lube but works just as well as any other condom. If the woman is lubricated enough naturally you don't need a lubricated condom. It's not the lube that protects you from pregnancy.
You might not neccesarily be pregnant, but there is a higher chance than if you actually used a condom, or any other contraceptive..
Like any other person
No there is no medicine for sperm enhancement hehe I achally don't know
No. You can't catch a STD from yourself.
He doesn't have any kids yet
Sperms are too tiny to tell whether any got inside you or not, or whether at any point of intercourse any got inside you or not. Whether he has pre-ejaculate on his penis after pulling out or not is not relevant. There is a tiny risk that some sperms got inside you and get you pregnant.