Hurmat-e-Musaaharah

Q:

1. What is the private part of a female that by looking at it hurmat can take place?

2. If a woman is wearing full clothes in a picture or in real life and someone unintentionally looks at her chest and lowers his gaze, and her cleavage is slightly shown, like a very small part of her cleavage, just few milimeters. Does this form part of a females body where hurmat can take place? Even if the person has no lust for her?

3. If a person has shaken hands with an old lady and he is 100 percent sure that there was no desire or lust at that time but he is having waswasa. Should he pay attention or disregard this thought?

Q: If a person has a stomach issue, when he eats spicy or high calories foods, he gets some white drops coming out from his penis in a normal state without any errection or lust. Now if he shakes hands with an old woman without any lust or erection, will this be hurmat?

Please note that there is no lust or erection for this old lady. The person has a stomach heat problem because of which he gets these drops when he eats spicy food.

Q: Please advise if a man touches or kisses his stepdaughter then what is the ruling in Islam?

Q: If a boy is masturbating and during masturbation he imagines a woman in his mind and he did not touch that woman with lust. So would this man be allowed to marry that woman's daughter?

Q:

1. If a son and father commit sodomy with each other, is it permissible for the son's (who committed sodomy with his father) children/grandchildren to marry his brother's/sister's children/grandchildren?

2. (A) committed sodomy with (B). Will (A)'s sister be allowed to marry (B)'s brother? Or Will (A)'s brother be allowed to marry (B)' sister?

3. (A) committed sodomy with (B). Is it permissible for (A) to marry (B)'s own sister/cousin?

4. If someone committed sodomy with his male cousin/male cousin's son. Are their children/grandchildren allowed to marry each other?

5. If someone touched his female cousin or his female cousin's daughter/male cousin's daughter with lust. Are their children/grandchildren allowed to marry each other?

Q:

1.If someone touched his brother's wife with lust. Will this break his brother's marriage with his wife? Are their children/grandchildren, etc. allowed to marry each others?

2. If someone touched his own sister with lust. Will this break his sisters marriage with her husband? Are their children/grandchildren, etc. allowed to marry each others?

Q: If someone touches his brother's wife with lust, will this nullify his brother's marriage? 

Q: If someone touched his own married or unmarried sister with lust, will this nullify his sister's marriage?

If she is unmarried at that time (when the incident happened), will her marriage be valid in future? What is the ruling if she is married at that time (when the incident happened), will this nullify her marriage?

Q: If a son and father commits sodomy with each other, will this nullify the father's marrige with the son's mother? 

Q: I had read that hurmat-e-musaharah take place only if there was a lawful relationship. I just saw a post that if a man committed zina with a women he cannot marry his daugther. But if he wasn't married to that women and was mislead by shaitan.

Below is what I found.

On the other hand Imam Shaafi (rahmatullahi alaihi) is of the view that hurmat-e-musaharah is established only through lawful intercourse and not through unlawful sexual intercourse or touching.