Masaail relating to intimacy

Q: I was looking for a kitaab on sexual relations like what is permissible and what is not but I haven't been able to find clarity on the following:

1) Is your spouse allowed to finger you whilst you're on your haidh

2) Do you only make ghusal after his sexual organ enters your body or do you only make gusal after he ejaculates.

3) If you feel uncomfortable or extreme pain can you stop your husband

4) Is it permissible for a husband to put his mouth onto the sexual organ of his wife

Q: Is it allowed in Islam for husband to rub or put his penis inside wife's breasts?

Q: Does Islam allow one to be intimate with his two wives at once (threesome) in the same room?

Q: What is the ruling on men physically forcing their wives into intimacy? I know women should not refuse, but in the case that she does, can her husband force her given that this will harm her (physically and mentally) and make her resent him?

Q: Is it okay for a husband and wife to see each others body naked and see their private parts?

Q: Can I touch my private part on my wife's body or chest? Is there any gunah or not?

Q: What is the ruling of a husband and wife showing affection to one another in public? Is there any harm if they hold hands, hug each other, or even kiss each other on the cheek and forehead in public?

Q: Is it permissible for a man or a woman to do intercourse if he or she is impure with wet dream without ghusl?