Oh yes, I am against creating two different tags. The reason is that since not everyone will agree on which is netori and which is netorare, creating two separate tags could mean that a netorare fan could miss out on a game that is tagged as netori even though he himself would consider it netorare, and visa versa.
With one tag, everyone will encounter all games of the NTR variety, and it is pretty easy to determine whether you consider a particular game netorare or netori. Should it not be to your likely, you can just move on.
Point is, I am MUCH MORE concerned about people missing out on a game they would had liked than I am about you wasting 3-5 minutes of your life browsing through a game you do not like.
It will also started the heated argument about what is netorare and what is netori and let's not do that PLEASE. We do not need more pointless and unnecessary arguments. Let's just keep it simple and use the NTR tag, as NTR can mean both.