Several things you can try: (For the male)
1) GO "commando" 24/7 absolutely no underwear, let your boys hang.
2) Wear a 1/2" or larger steel cockring. Sized correctly, it won't come off even if you're a "grower" & lt will keep your boys from sticking to your leg, holding them sligthly away from your body helping them get air, remain cooler, thereby increasing sperm vitality and viability. Also feels great, keeps your unit blood engorged increasing blood circulation which also enhances healthy sperm production.
3) Take a good male multivitamin rich in zink.
For both of you:
1)Calculate her ovulation cycle and have sex as often as possible during those days of the month.
2)Best position is "doggy stlye" which allows maximum penetration, and greatest ejaculate delivery directly into the cervix. After ejaculation, it is important for the female to remain in the doggie (head down), posterior elevated position; allowing the sperm to stay in her cervix tilted downward enhancing conception opportunity.
3)Eat a healthy balanced diet, rich in anti-oxidants and good fats like salmon (raw oysters for Him as well). dark green leafy vegetables, avacados, dark cheeries, plums and strawberrys. Stay away from anything containing soy.
4) She needs prenatel vitamins rich in folic acid as well, before conception.
Good luck conceiving your shild in an all natural way that's healthier for all of you.