12 days
I use SMS specifically because of the network effect. Almost everyone I want to communicate with has a cellphone, so all of them are capable of sending and receiving text messages. There is no need to list my installed messaging apps and compare it to theirs, we just need to exchange phone numbers.
My longest and most active conversations (chatting with my wife or my closest friends) are going to be over a more feature rich app, but if I need to set up a quick chat with 3 or 4 people, I am not going to think what messaging app we all have in common, I will just start an SMS group chat.
Maybe he could get consenting partners, but wants a girl passed out drunk before he makes his move? Judging by the fact that he is obsessed with improving his own appearance, I assume he is extremely insecure about his body. Is he too shy to undress in front of someone who will remember what he looks like?