If you don't like having casual sex or if that's just not something you're looking for, that's fine. However, to constantly shove your moral grandstanding in other people's faces is just annoying and desperate. Other people aren't unclean, uncareful, irresponsible, valueless, or any other negative adjective simply because they consensually do what they enjoy with their own bodies. You're not any more special or noble or enlightened because you just have to have a special connection with someone before you do the deed. It's cool if you feel that way, but it's also cool if you wanna just have sex for a night and go home after.

It's not wrong to want to have sex with no strings attached with as many people as you want, just like it's not wrong to want to preserve that memory and that moment for someone you feel strongly about. There's no right or wrong way to go about things.