Ringing At The Wrong Time

Why is it people always call at the most inconvenient times? ie when you're making love or have just sat down to a nice dinner!! Grrr! I'm bad when it comes to answering my phone anyway and I usually just leave it ring, if it's important they can ring back or leave a message anyway. Slowly I'm beginning to actually despise the person who invented the mobile phone - now theres just no escaping the constant ringing - unless of course you put it on silent but then you always seem to miss a call from the one person you actually WANT to speak to *sigh*