Hello, For successful conception, you have to undergo unprotected sex for 6 to 12 months continuously close to ovulation day or within fertile days. It should be monitored by ovulation prediction kit or serial follicular study in mid cycle after taking ovulation induction drug. Low rapid linear movement is also a cause of male infertility. He needs to take Co-Q, zinc, Vitamin-E supplement with balanced diet to improve the condition. Kindly, consult with infertility specialist if you fail to conceive after 6 months. Good luck.