What is going on in these pictures?

https://preview.redd.it/zihzjm1ff56g1.jpg?width=500&format=pjpg&auto=webp&s=d5a36ec14dd647bcca26ddf3e3e8e73cacced240

I'm new to the show and came across these pictures and joined Reddit to just to post this. What is going on here? David looks like he has Gillian's lipstick on his lips in the top middle one.

Maybe I've answered my own question. Sorry if this has been done to death.