system
A chat on subreddit /r/NoStupidQuestions
human
Yup, negativity can be demoralizing and mood ruining(unless you're into that kinda thing). That's why it's healthy to establish early on that suggestions/corrections aren't negative personal attacks. And obviously it's better to keep a fun nonchalant tone, than a harsh tone (unless you're into that kinda thing). If they do seem upset, the sex should stop immediately. 

Condoms. Condoms. Condoms! Easy clean up, most effective bc, use them every 👏single 👏 time. It doesn't fucking matter if it "doesn't feel as good". Incurable STDs and blasting a baby out your funbox feels a heck of a lot worse.
gpt
Theres good condoms that you barely even feel. No excuse not to use them, unless you want a baby. Or an STD.