There are no exact answers to many of these questions... they will vary for different people.
Your questions about condom use have already been answered... Please make sure you read through the information we give you, and the answers already given (everything is already there). If you still feel you can't trust your own knowledge on reading on this, I would suggest talking to your partner about stopping some of the activities you are doing if they are causing stress.
"In between two tall mountains there's a place they call lonesome.
Don't see why they call it lonesome.
I'm never lonesome when I go there." Connie Converse - Talkin' Like You