intercourse every other day is plenty to get a woman pregnet! 2x a day every day is pointless other than for fun, lol! I'll tell you this much, some rules for donating sperm to sperm banks is as follows, no kind of male ejaculation for at least 4-5 days prior to donation, the reason being a lower sperm count per load if this rule is not followed.
Make sure you are taking a cal/mag/zinc supplement throughout the day every day, they are beneficial for sperm, also Vit. E., and a couple cod liver oil caps per day for round-about general health, imho.
Good luck bro!
dg