I remember seeing this comment on youtube and dug it up

The whole ‘kissing’ in DBS is completely misunderstood and lost in the translation. Since in the sub the whole word ‘kissing’ is never mentioned. There Vegeta asked if he have never done ‘that’?

G:’Woah Trunks! You actually put your mouth up against hers?’ Goku was surprised about giving the senzu bean mouth to mouth to May.

V: ‘you’ve never done that?’ Vegeta is confused and thinks about the specific action of (romantically) kissing someone in the mouth.

G: ‘Of course not.’ Still thinking about the giving the senzu bean to someone through the mouth (OR literally answering if he ever put his mouth on hers(aka Mai’s)

V:’But you’re married!’ Thinking about that kissing is something you do when you’re married.

G: ‘Does that have something to do with this?’ As in Goku doesn’t understand what feeding someone trough the mouth has something to do with being married.

V:Wh-whatever!

So it’s simple miscommunication between Vegeta and Goku. Only the dub interpret it different and changed it. Sub is ‘you’ve never done ‘that’’, while de dub translated it as ‘you’ve never kissed someone?! Two completely different ways to interpret the situation.

Also, funniest dumbest thing I seen in anime is Ultimate Teacher (1988) the entire damn thing.

I like that interpretation. There was a funny comic with him talking to Chi-Chi in bed about it and them continuing the misunderstanding, wondering what kind of weird stuff Vegeta and Bulma are into.