I can't think of what fruit they mean, but there are so many that it wouldn't surprise me if there's a fruit that looks exactly like a dick or an anus or what have you.
Some women unironically use bananas as a dildo.
There are those flowers that absolutely look 100% like a moist pussy.
Pic related is a fucking sentient potted plant.
Humans will fetishize and fantasize about fucking (and sometimes attempt to fuck) absolutely anything and everything. It's why Rule 34 is so real a thing- there are genuinely people who want to fuck airplanes, floor tiles, the state of Ohio. Some will just joke about it, but someone out there is vigorously yanking their meat or jabbing their slat to a map of the United States right this second. Someone out there is licking their kitchen floor in an attempt to make love to it. And I'm sure more than one person has put their dick in a venus fly trap thinking it'll feel good.
We're not alone, of course. All animals are deviant little bastards. Fucking corpses, members of different species, pillows, a tree stump, the ripped-off head of a fish, etc.