In preferences we have the ability to unchecked a box to prevent accidentally TPing to an Adult region. The current options are G, GM, and GMA, but there is no option for either M or MA without G.
It would be nice to have the option to block G regions if one is only in SL for adult activities and dresses that way. A warning pop-up letting a person know that the region they will be landing in is not in their safe region rating and asking if they want to TP anyway or cancel the TP would also work.
Give us the option to prevent an accidental TP if we have inappropriate clothing on for the land rating. Gotta keep Grandma happy!