make more sperm
Of course.
You can't really do anything to produce fast sperm. It all depends on your wife's ovulation schedule as to when she might get pregnant. You can try at home ovulation kits, they might help you get an idea as to when the best time for your wife to get pregnant is. As far as if you are trying for a girl or boy keep in mind the "slow" sperm you produce is stronger and equals girl where as the "fast" sperm is weaker and will produce a boy.
either the egg or sperm is from another person
After your materbate, Keeps it fresh. :P
Yes, there is always a risk. It only takes one sperm to fuse with a ripe egg for a girl to become pregnant and the egg doesn't care how the sperm got there.
No. If you are pregnant, swallowed sperm will not affect the baby. If you are not pregnant, swallowing sperm will not make you pregnant.
No; sperm must enter the vagina to get pregnant.
Swallowing sperm will not get you pregnant. The stomach acids will kill any living sperm. You can only get pregnant if sperm makes contact with an egg.
human sperm cannot get a cow pregnant. The only species humans can get pregnant with their sperm is another human.
No, a girl cant get pregnant from sperm on thigh........
Any sperm can get a women pregnant.
Yes, sperm is the only thing that can get someone pregnant