I can't speak for everyone on SW but I have a protocol for DMs.
First, you have to be active in the forums. Why would I be interested in talking directly with you if I know nothing about you from the group forums??
Second, you and I must have at least seen each other in the forums, maybe even have commented on one another's posts or something.
And lastly, if you DM me and start hinting toward anything sexual before we have established a connective rapport, your message is definitely gonna be ignored.