This is true. Fun things can be as sexy as .. sexy things!
My model friend used to have "Naked jumps" which clearly is not sexy, but she is a happy person and her laughter whilst doing such an absurd thing always entertained the room.
As for sexy things, well oil and ice applied to body parts can be sexy.. if you as the model enjoys them. (or if it becomes a funny challenge in the case of ice). In truth I have seen very few models who do "Oiled boobs" well, I suspect because most of those I have seen doing it, do not genuinely enjoy it or get actual pleasure from the stimulation.
Sucking a finger can be good also (as long as it is done in a sexy way and not like a calf sucking on a teat)
Moaning a user's name is good also (If you can do a convincing sexy voice.. even if at the end, you break down laughing)
As someone also said above, if you can do a cooking show or a renovating show, they will most likely be very popular.