Take frequent rest breaks during prolonged sex sessions.
Temporarily withdraw from the sex scene. Go outside or get some fresh air.
Also, use the chill time to experience how you are doing physically and mentally.
Under the influence of chems, you can go on much longer sexually than during sex without drugs. The use of drugs during prolonged sex can be quite a drain on the body and mind, so it is good to chill out regularly and recharge during your Party & Playdate.