Wudhu

Q: Is wudhu valid with lipstick on lips?

Q: Why is wudhu not valid if someone wears nail polish? Wudhu is a matter of cleanliness, so if anyone wears it after cleaning their nails then the dirt will only touch the nail polish. When performing wudhu, the nail polish will be washed. So why should the water should reach the nail? 

Q: I read that while performing wudhu, we should wash our face upto the hairline. But if someone's hair has receded and his hairline has risen above the normal position or he has lost all his hair and become bald, then where should he wash his face till?

Q: While taking a shower, will the wudhu be done or is it compulsory to do the wudhu separarely?

Q: Is it necessary to wash the area between the sideburns and ears in wudhu?

Q: When making wudhu, should miswaak be made before or after gargling the mouth?

Q: When should khilaal of the fingers be made in wudhu? Should it be made after washing the arms till the elbows or after making masah of the head?

Q: A person did not wash a part of his body properly in wudhu, or forgot to wash a part completely. He finds this out after he has completed his wudhu and dried himself. Can he just wash that part again to make his wudhu valid or does he have to repeat his wudhu?

Q: I used something called a douche... I insert it with liquid medication and insert it into my private part and wash myself out. Thereafter I make wudhu. When I come out of the shower, some of the water comes out from my private part. Is my wudhu still valid?

Q: I am a 30 year old newly married male. When I touch or kiss my wife, a little amount of semen comes out. In this condition can I perform namaz by washing the affected area without changing clothes or underwear?