If you want to start a sext conversation on Whatsapp, the best way is to start with something subtle yet suggestive. You could start by sending a flirty message that hints at what you're thinking or feeling, such as I've been thinking naughty thoughts about you all day. This kind of message can easily open up a conversation with your partner and provide an opening for them to respond in kind. From there, let the conversation flow naturally and don't be afraid to get creative!