Rear seal or head gasket, I'd bet rear seal though.

Separate trans from crankshaft, replace rear seal, re-assemble.

 

add some uv dye to the oil, park in the dark and slap on the detector glasses

 

I think this oil leak is from camshaft plug replace the plug which not be more than few bucks. Hope this help

 

if replacing the cam plug you need to put rtv around the cam plug where it sits in the head and under the cam cap where it meets the head

 

Check out the 3 Vtec seals, valve cover gasket, and intake manifold seals as well as the rear cam plug. If its not obvious where it's coming from, then clean off the engine with a power washer or brake clean and rags, let dry, and spray the entire engine (including the back by the intake and from underneath) with athletes foot powder spray (I used 2 cans). For added security, I did an oil change and used Engine Oil UV Dye. Run the car for a while and use a UV light to see where the leak is coming from. The powder plus the UV dye might be overkill, but I didn't want to have to do it again (which is my current problem).

Hope this helps, and good luck!