The temptation is enormous to go for G for Gerund.
But in the age of sms'es and short-cut text messages where lol and imho are quite freely used, I wonder if talking about what requires a possessive case and when to use the objective case would be of any use. I'm not sure if attempting to differentiate between a verbal participle and a gerund would be of any interest to my readers.
The appeal factor is questionable.
On the other hand I am fairly certain of the (sex) appeal of Ginseng and Gear Box Soup. So let's go with these, shall we: