Sex tips for bf (m, 25) and I (f,24) on MD So my boyfriend and I have never taken md before but really want to roll and have a sex marathon.

He weighs around 80kg and is 5’11. I’m around 53 kg and 5’7. We’d really appreciate any advice and tips on dosage and how to ensure he can maintain an erection and hopefully cum multiple times. He’s thinking of taking a cialis alongside. Would u guys recommend that and if so should he take it 45mins before the md? 

Thanks so much!