My hubby having motility sperm issue.. what can we do?

we went for a check up at a medical hall recently and was a huge relief on my part to know that i can have children and can get pregnant anytime. However, my hubby is having motility issue and this could be the reason why we are still not pregnant aft 1 yr of marriage. Well.... what could really be the reason for motility... will lotsa masturbating actually cause motility and what can my hubby do to increase back his sperms quality? Can i still have babies???