Nikaah & Marriage Issues

Q: Can a husband marry his stepdaughter or even his own daughter and the marriage still be valid with his wife?

Q: I am a Muslim and 29 years old. I was an engineering student and during my bachelors education I used to teach Science Subjects to Intermediate co-education classes (11th and 12th Grades) in an Academy to meet my expenses as my father was suffering from financial crises. I used to control myself from developing feelings for the opposite gender and I succeeded nonetheless.

After 4 years of teaching, when I graduated from University, I found a better job and went outstation and I have been currently serving as a Senior Officer for 6 years.

When I got my job, my parents started searching for marriage proposals for me but they could not find a good proposal for 2.5 years. It has been 6 years since I left teaching.

The issue is that 2 years ago, I along with my class fellows had a get together in the University, and after having the meet up, when I was going back home, I saw one of my past female students (She was the sister of my my class fellow and I knew her even before teaching) in the University Library coming in front of me after so many years and her habit of keeping her gaze low and noble character forced me to develop feelings for her and I started to think about her as my wife.

After thorough thinking, I then sent my proposal through my family to her family and her family accepted my proposal whole heartedly because they already knew me.

My Question is that Is it allowed in Islam for me to marry her as she was one of my old students although at the time of teaching I did not have feelings for her in my heart and I am not teaching anymore? 

Q: When a husband has intercourse with his wife and he ejaculated but his wife doesn’t get an orgasm yet. Is it permissible for the husband to use a vibrator by penetrating it in her vagina to satisfy her sexual desires?

Q: Can a wife call her husband by his name?

Q: I am a Muslim but my boyfriend is Hindu. He is going to convert to Islam and then we will get married. My question is that after accepting Islam, he wants to keep his culture the way it was. For example, he wants to have a wedding according to the Hindu culture. Is it permissible for him to keep his Hindu culture?

Also, I am willing to turn vegetarian because he was brought up as a vegetarian. Is it permissible for me to do this?

Q: Do only parents have the highest position and right to be respected and kids deserve no respect? If parents don't treat every child with equality by loving one child more and not caring for the others, is it ok in shariah?

Q: If a person commits zina with a woman and later on do nikah with her daughter, what must he do now?

Q: May I ask why Muslims have become interested in things like 'sex toys' in marriage? It seems all very strange and weird. What is the cause of this odd interest by Muslims?

I researched this and the manufacture or sale of 'sex toys' was actually prohibited in South Africa by the apartheid government. The ruling was lifted only in 2007 by parliament.

Q: Is it compulsory to have sex on wedding night with your wife to make walima halaal the next day?

Q: Does Hurmat-e-Musaaharah take place if a grandfather touches his grand daughter with lust?