I wasn't even going to say anything about the first post. But the no protection thing coupled with the first post? No no no.
As far as being invincible....I've always been a big fan of condoms. I've gone without, but not until a well established mono relationship and on birth control. Apparently, I'm one of the .1% it wasn't effective for. Or we just had already had condomless sex 99.9 times and wore out our luck.