How do Bidets work?

I'm looking at renovating our en suite bathroom and my husband really wants one of those japanese toilets. The one we're looking at has a bidet function. I'm looking at the pictograms and it looks like if you go for a number 2 you would just poop on the nozzle. Is there something I'm missing? The way it looks in the catalogue looks absolutely vile. Also how strong are these things?