Good question. There are many good reasons, here are just a few. 

Real contact - real guys (who like you, are horny) looking to play now - no 'email tag', 'no-show's', 'pics from 10 years ago'. You can figure people out a lot better when they are right in front of you.

Safer/Healthier - when you hook up with someone you are not alone. At Menfriends you have the support of Venue Staff, other clients and the condoms and lube are free and easy to access.

Quicker - how many hours can you spend online and get nothing? You can often hook up at Menfriends within minutes.

Better for you - Online hook-ups are ok but anti-social for you as a person.  Spending your sex life online with 'discreet hook-ups' is a recipe for a lonely life.

More on offer - for those horny moments - spa, sauna, steam room, free internet, free pool table, porn TV's etc