I agree that girls should not wear tight fight (specifically in villages or small towns, not applicable in metropolitan cities or offices if suite is not a dress), the reason is most of us (young guys 14-30) are not mature enough to decide where/when to stop in case of distractions. And if a girl is not exposing herself chances of eve-teasing are very low.
As per the sperm count goes studies don’t blame jeans for that.
http://health.ninemsn.com.au/whatsg...3/does-wearing-tight-jeans-make-men-infertile
So if tight pants don't cause infertility, what does?
"The cause of infertility in males can vary, often we don't find a reason why sperm counts are reduced but the obvious ones are certainly poisons and toxins that we're exposed to such as smoking cigarettes, social drugs but also other chemotherapy agents, infection, trauma to the testes — lots of things can upset the way the testes normally produce it's sperm," says Dr Gordon.
And if you happen to like hot baths, think again. Studies in Japan and the US suggest taking a bath at 42 degrees, three times a week, can significantly lower your sperm count.
The good news is, it's reversible. Just wait six to eight weeks and your body will make a new batch of healthy sperm.
दामन और स्किर्ट में क्या फर्क है? : I think below images may be a help: