haha.. I know the "do you like horny bunnies" ones
they are hilarous
if you want a quality game that is of "hentai" type (like the above ones), try Dividead. a pain in the ass to be found (at least was hard to find when I tried) but very very good. and scary as hell.
just to say few other ones that I have: "come see me tonight" (story of a guy who becomes a cook in restaurant after having been dumbed by his parents), "casual Romance Club" (dating club - pretty good, well done), "chain" (some kinda detective story, pretty good as far as I have been playing), "snow drop" (nice story, a bit spooky),"tottemo pheromone" (okay game) "true love" (the one game that you should try if u want to date virtually - many sites have ranked this one the best game of its type. even if u dont feel so interested in Hentai, give it a shot) and "season of sakura" (pretty old game but is done well, pretty near of the reputation of True Love)
I've played quite a lot of these type of games, kinda like em
and well.. they are quite rare and pretty nice piece of programs / games to be collected lol
on that list I just gave some of the best ones, some are older than others.. feel free to shoot questions, I can try to dig up some links at some point.