It could affect his sperm count, could he cut back a little while you're trying to conceive? Some people are just so fertile it doesn't matter but if you've been trying for a while and it hasn't happened I'd start making some changes.
Lots of water for both of you, no smoking, track your periods and when you're ovulating.
deep penetration in sex positions and sex every chance you get lol. also help them guide along by putting a pillow under your lower back and let your legs elevate a little to guide the sperm a little better to your cervix. No tighty whiteys for him lol
^^ I agree.