As far as I know Eden is still a love hotel. Here check out this link to its website which states that it can be rented in two or three hour blocks as well as an overnight package after 1am.
Link :
http://www.mingleplace.com/eden/
For any hotel, the person who is paying and staying shows ID, ie HKID, passport. So if you don't want to show ID, ask the girl to show hers.
Another hotel that is very clean is the Victoria Villa love hotel chain. There is one in TST, Wanchai, Tin Hau.