Dear Sachin, Welcome to Healthcaremagic!
Specifically speaking, there is no evidence that lemon water per se will increase sperm count
and/or male/female sex power. But if a person is having clinical deficiency of vitamin C
[ie., scurvy], he is likely to suffer from oligozoospermia
. In such a case, vitamin C from lemon would help. I hope this clarifies your query. Good luck.