Here are links to the two really well known brothels. I forget the exact prices, but I think it was 70 - 130 Euros for various half hour, 45 minute and one-hound sessions. 30 Euro upsell to come more than once, with the irritating upsell for anal. Some are BBBJ, some are CBJ, some upsell CIM, a few reports of that being included.
The prices are from memory, so I may be off a little and they may have changed. I think Top Damas is a few Euros more expensive.
http://www.topdamas.com/en/
http://www.felinabcn.com/en/
Felinas is walking distance from the Metro stop. Top Damas is on a bus route, but a bit of a hike to walk from the Metro stop. Taxis are cheap, so most people cab from the Metro stop if you do not want to take the bus.
When walking in Barcelona, PLEASE NOTE that when the sign changes from WALK to DON'T WALK, the car traffic starts right ways. In the US there is a 15 second or so delay. In Barcelona there is literally a one or two second delay. I thought I was going to get killed. I saw other tourists make the same mistake. Wait at the stop until the crosswalk turns green and walk. If you are not standing there and see it turn green, just wait for the next cycle. It is insane to do the lights like that. Otherwise it is a truly fantastic tourist city.