Don’t read their messages and not reply.
Reading and not replying to messages pisses everyone off, but even more so, it pisses your partner off. And a pissed off partner means no sexy times and no snuggles. Even if it’s just a simple “Okay” in response to whatever they said, it’s still better than not replying at all. Plus, if you reply, more chances for a cuddle puddle or “Fun times”.