Hurmat-e-Musaaharah

Q: When a person touches a woman and there is no erection, there is only lust and desire in the heart, so can he marry her daughter?

Q: If a person touches a woman intentionally but there is no lust before and after, is hurmat-e-musaaharah established?

If a person touches a woman intentionally but there is no lust, can he marry her daughter?

Q: I heard that looking at the 'farj e daakhil' of a woman establishes hurmat musaaharat. What is meant by 'farj e daakhil' ?

Q: If you don't know about the ruling of Hurmat-e-musaharat, and you find out about this rule about a one month ago, what happens? Will hurmat-e-musaharah still take place or Allah will forgive him? 

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

Q: If a daughter sleeps with her mother and her body touches her mothers body and the daughter gets a slight strange feeling but no sexual thoughts, is hurmat musahara established?

Q: Would a couple be responsible if they don't know that another person has impacted their marriage? For example, (may Allah protect us all from this) if a daughter touched her father with lust but neither her father or mother know about this, would they be responsible? Would the daughter be sinning if she doesn't tell them as it could have disastrous impact on the family? Would her parents be sinning as they don't know? 

Q: A generic question about "hurmat e musahara". I know lust is defined as the erection of the penis. Does slight movement in the penis, similar to what happens during kegel also cause hurmat e musahara when erection does not properly occur/no full erection occurs. I get anxiety and I'm scared. I'm more or less certain that I've never had a proper erection while touching my mother, but at the same time I'm scared of slight movements in the penis that may have occurred in the past - movements that may have occured due to my mental condition. Especially since the idea of potentially negatively impacting my parents is often on my mind when any physical contact occurs with my mother. A slightly detailed and clear answer on this issue could make the matter clearer to me as often I'm not sure what constitutes lust and it makes the matter tough for me. I'd like to think that I do not in any way want to engage in intercourse with my mother and the idea is reprehensible to me. It's after I started reading fatwa on these that these thoughts have significantly started bothering me. 

Q: Will Hurmat-e-Musaaharah be established if a girl is 2 years old?