Nikaah & Marriage Issues

Seeing the girl before marriage

Q: Is it permissible for a boy who wishes to get married to see the girl? Nowadays when the boy goes to see a girl, then they both sit and speak?
Is this permissible if done in the presence of the girls parents? I am not speaking about after the proposal is accepted by the girls party for boy and
girl to meet and speak. I know this is not permissible.

Homosexuality

Q: My question is that I am a homosexual man and I know that it will be very hard for me to fulfil my wife's rights if I ever get married. Is marriage still fard on me  in such a case. I don't practise any homosexual acts but also so know I will never be able to have sex if I got married.

Wife claiming that her first husband did not divorce her

Q: After married to a second husband for 20 years, the wife declares that she is no longer married to the 2nd husband because she was never divorced from the first. The 1st husband reclaims his wife. In the 1st marriage, no talaq was mentioned. The husband just stayed away from the husband. Is this allow in sharia and was the second marriage valid. What's the ruling on this?