1. A sexual question - uma pergunta sexual
2. Sounds innocent to those not familiar with portuguese - Para quem nao fala portugues, esta frase aparece inocente
3. sounds like / ouve-se com - Quers Ketchup?

this question means 'do you want to be sucked?' - OR - 'Do you want a blow job' (queres que te chup?) BUT this question sounds like 'Do you want ketchup?' A common joke in brazil:Manuel asks Maria -Queres que te chupe? (sounds like Do you want ketchup)and she answers -Nao, mais tarde (no later) which appears to be No, mustard. (This was taken from The Alternative Portuguese Dictionary)