Yes, there are risks associated with sending explicit messages over Whatsapp in a dating context. The most obvious risk is that the message could be forwarded to someone else or shared publicly without your consent, leading to embarrassment and potential reputational damage. If you don’t know the person well enough, they could use your explicit messages against you in some way or make you feel uncomfortable. It's important to remember that once something is sent online it can never be erased completely, so think twice before sending anything explicit.