So you've seen those trader folks on the main townsquare? And you suddenly felt huge sexual desire for them for some unknown reason?
If you answered in the affirmative on both of these questions then get ready for the most useless guide out there.
So...
Make sure to not forget all those steps.

1. Cover yourself in oil.

1. Talk with the trader.
   
2. Buy all their ♥♥♥♥.
   
3. Flirt.
   
4. Have sex.
   
5. Profit.

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Everything was tested on Girda, owner of "The Itch". My character was male but I guess anything with a penis would work. I suppose intimacy is possible with other traders too but I haven't checked that yet.
That's all, thanks to whoever who wasted their time reading this. Have a nice day.