Rulings pertaining to intercourse

assalamualaykum.w.w. Thanks a lot of mufti saab.. May allah reward you for the work you doing.
I m 28yrs male, married,
1. what ways are allowed to have sex
2. Time of having sex is it necessory to cover on top.
3. Is it allowed to take a medicine which gives power.
4. R we allowed to lick n suck each others pvt parts