Toumei Ningen (OVA)

Ever wonder what your life will be when you are invisible? well now is your chance. Toumei Ningen and Kisaku Spirit breaks the boundaries and place you in a dream situation where all your desires will come true. With no one stopping you and all the woman in the world in the palm of your hands, this is a paradise not for the faint-hearten  

Both involve one male protagonist. Supernatural elements come into play, with objects given by mysterious strangers. One gets a board game that forces players to preform sexual acts, the other gets an invisibility pill. Both have a semi-cheesy humor to them that may elicit some actual laughs. Also, same animation group. 

Both OVAs have hentai and comedy combined and involve magic devices and seducing women who are actually not against it :) 

Both of these are very similar and somehow the guy with the hat and sunglasses appear in both of these anime making mischief on people who see him also both male character works in a convenience store and you can see a little cameo of some characters from each other 

Legend of the Pervert is about a lady boss trying to get back at a guy that caught her earlier doing nasty things. She tricks him into touching her it get a bit funny. The Invisible Stud is also pretty much, what would u do if u can be invisible? Well this guy does all the girls he wanted to do. Will he get caught? Watch to find out. Is both mainly comedy with hentai