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They do oil massages as well, if you're worried about being dry.

Seriously, if you want certainty, order an escort. I like the game at the massage joints / kiss rooms more.

Speaking of: Went to...

You negotiate with the girl.

https://goo.gl/maps/jASy36yuBHmGghUD7

So at the exit, turn right, then follow the rest of the instructions.

1 hour is not the only option (20/30 minutes are possible too, don't remember those prices), but you're right. I mostly went because it seemed like an interesting experience, and I was horny, haha.
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I visited the Kiss Room closest to Hongdae exit 1 today. 1 hour for 80 k, HJ 50, BJ 100, FS 150. Went for the BJ and was not disappointed. The girl was 25, an office worker, small be cup but a good...

These instructions are a little outdated but easy enough to follow. Kiss Time is called Secret Kiss these days, in the building with boss. I'll report back when I've sampled the wares, so to speak.

+80 for FS. I didn't ask if there were Korean options, mine was Thai and fucking stunning.

Decided to give this a shot as well. Same price but the girl was pretty hot. Had a good time, definitely going to try again.