Greetings.

I suppose two possibilities suggest themselves. (1) Try it. Google "BDSM munch Barcelona" and you'll find leads to social gatherings near your home. Go to one. Meet people. Play with a flogger. Try to get a sense of which end of the flogger you prefer. Or (2) talk to someone who has tried it. Perhaps post a question on the "switch" forum or PM one of the folks there, hopeful of starting a conversation.

For what that's worth,

S.