Yes I know that moment :D. I think Bojack is using Erica to try to get rid of Mr Peanutbutter in that scene. Also his ex wife is also using Erica to fetch her a drink as a payback for all those moments when Mr Peanutbutter ignored her when she needed him. So they are just ironically fighting him back with his own weapon.
“Bojack used to say his penis is like sun-dried tomatoes. Back in the '90s, it got into everything” Among other things, it went into Princess Caroline… So, nothing special.