Nikaah & Marriage Issues

Q: I am a Muslim guy and I have been in a relationship with a christian girl for a while. I am trying to make this relationship permissible on all aspects and I want to marry her but we are not planning to register this marriage in the court (not legal marriage) just Islamic so that we can be confident that whatever we are doing is not a sin/Haram. We are very serious in this relationship and we want to take it to a legal marriage level but not now since she is still a college student and her parents and not fine with her getting married that early. I believe, I can fulfil all the Islamic marriage requirements from bringing in witnesses to announcing my marriage. It's worth mentioning that we live apart in two different cities, more than 6 hours away from each other but we do see each other every once in a while.

My question is: Is marry this girl according to the Islamic laws permissible?

Q:

My first question is: In Islam, when does a child have the right to go outside and maybe socialise or even go to the mosque and come back by themselves. Say a general ruling for maybe a boy who is 13-14 years old.

My second question is: Up to what extent is an older sibling allowed to punish a younger sibling i.e. corporal punishment or verbal? 

My third question is: If your parents say something like "I don't care about what sunnah or fatwah says, it's about what I say! It's about me!" how do you respond in a respectful way.

Q: Can a Asian man marry a Muslim woman that isnt Asian by race?

Q: Is it permissible in Sha'ria to have sexual relations with your wife while she is 7 weeks pregnant?

Q: I'm in love with a girl who is 7 years older than me and she love me as much as I do. We both want to get married and start a life. So to ask her hand for marriage there is one thing I want to know, is it permissible to marry someone older than you like with 7 years age gap? And we both meet each other everyday as she is my teacher and I'm her student, she teaches me. So is it okay?

Q:

1. Is is necessary to change the bedsheet every time after having sex? As some fluids may come on it.

2. Is is possible for wife to masturbate his husband's penis?

3. What is the best treatment for premature ejaculation and erectile dysfunction? Any ayurvedic drinks or any thing according to Islam?

4. Is it permissible for both of us to take shower together ?

Q: What is the rulling regarding a secret nikaah if both boy and girl are of a mature age and the parents refuse.

Q: During my nikah, I was not opposed to the marriage, however the witness only asked me who I wished to take as my representative, not if I accepted the marriage or not. My brother performed the qubool on my behalf. Is this correct, or did I have to verbally say I accepted the marriage?

Q: I want to know what is the kafara of doing anal sex with your wife when she is in her monthly periods . The husband claims that it was by mistake but the wife said that it was on purpose and this thing happened the second time and the first time both agreed that it was by mistake. I know there is a way in Islam to batch up with your wife if a person does toubah and promises not to do this thing again but what will be the kafarah?

Q: We follow a practice in the case of a marriage proposal that first the boys mother comes to see the girl, then both parties make itikhara, if positive, then we go for investigation, meet the boy personally and thereafter when everything appears to be positive, the girl and the boy are shown to each other face to face. My question is that when the girl is shown to the boy after all other steps are done, can she show her hair or uncover her head in front of the boy only with whom she is being proposed to marry?