I think the "midlife crisis" aspect of it makes it a bit more substantial, rather than purely just fun songs about sex etc on their own (which I think it's fine to make a few of anyway) there's some more introspective and thoughtful songs like Lazy Bones and Amy in with them. In the context of the album it's about all kinds of midlife crisis issues with partying, drink and drugs, dark thoughts, resisting and giving into temptation and the consequences of it as well as just sex, I think those are real and legitimate issues to write about.
I quite like that for a change though, it's always been clear they're capable of writing about it more overtly (from Tre's songs, side project songs like Right Hand-A-Rama, sexy antics during Hitchin A Ride or at Foxboro shows etc). Not saying I'd want all their songs to be that way but it seems fitting that they'd have added a few overtly sexual songs to their "proper" Green Day catalogue by now.
Whether said songs are shite or not is a matter of opinion of course