Well said Magic Mexico.
As for sex before 5-MeO-DMT, I think it would generally be okay. However, depending on what kind of work you are going to be doing and how deep you will be going, sometimes sex can be draining to one's body, mind, and spirit. If it's the kind of sex that gives you life and energizes you, then it will likely be fine. It's just a matter of your relationship with that person you shared that intimacy with and what kind of energetic exchange took place.