Walk up to a tree or shrub and press g, then select the option that involves fire. Not sure if it works on corpses.
I've not tried them all yet, Fortress mode keeps pulling me in, but I liked my speardwarf and hammerdwarf when I made them. The spear tended to get lodged in limbs though.
Stand next to anything with flesh. Shift-a to attack, press enter to switch to wrestling mode, select the creature you wish to wrestle and grapple it's head with a HAND. Then, go into the wrestling mode again and below the pinching options, should be gouging ones.
I spend half an hour wondering why I still couldn't gouge eyes when I had a mule's head grappled with my upper and lower arms and both legs.
Walk up to any girl and press k. Greet them and select the 'date' option. There's a chance, based on what you're holding, how well you know them, what you're wearing, what you last ate and how many goblins you've slain, that she might accept. Do not attack her if she says no.
Hope that helps