First messages that invite a conversation
A personal, considerate opening gives someone an easy way to reply.
Notice a real detail
Refer to something the person chose to share in their profile. A question about an interest or the kind of connection they want is more useful than a copied invitation. If the profile gives you little to work with, introduce yourself briefly and ask an open, everyday question.
Keep the invitation light
One thoughtful question is enough to begin. Avoid demands for private contact details, explicit pictures or an immediate meeting. A shared interest in pegging does not remove the need to check whether intimate subjects are welcome in that conversation.
Make replies optional
People use dating sites at different times and may not want the same connection. Let them choose whether and when to respond. If there is no reply, move on rather than sending a series of reminders. A good conversation involves mutual interest, not constant availability.