Well there are some people who... well I'm not one of those people.
Anyways, if I do get laid this year I'm wondering what I could provide as evidence to show that I did the deed.
Nothing. You've been overtly honest here. I think we'll believe you when you say you've had sex. If you want to pressure yourself into something positive, having sex is not one of them. You're a pretty awesome guy with some confidence issues. If you want to pressure yourself into doing something, it should be being more comfortable with yourself.