RLV has a bad reputation for being used a lot in slave/bdsm roleplay. But it is safe to use it for other cases. I use it in some of my products. sometime mandatory, sometime optionally.
Good to know
Enabling RLV on your viewer does not expose you to actions from others until you wear some RLV device
Only objects you are wearing can send RLV commands. not rezzed objects around you nor objects worn by others.
RLV can not access your L$ account.
When RLV is active you can always check what attachment is doing what in your RLVa menu under Restrictions
RLV API documentation