I can understand a dive guide not wanting to take divers of unknown provenance through Love Tunnels, but an outright ban seems a little extreme. But maybe that's his position anyway - he won't take anyone he doesn't know is capable of it.
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Just talked to my dive master and he says he won't take people to love tunnels. The reason is that it is very dark and you cannot see the exit. There is a cavern style opening that people tend to get "stuck" in. The reason is that the exit is low and people go up instead of following the divemaster. Love Tunnels is not very far north at all, it is in front of El Pescador. M&M Tunnels are actually further North (in front of Sundiver) just north of White Sands Dive shop. M & M Tunnels are awesome, safer and one of my favorite dive sites on the island. See my post above.
Cheers,
Carlos