I've been asked to do line art for an adult coloring book based on a series of romance novels. I would love to find some resources on drawing couples- mildly erotic (definitely not pornographic, but passionate/romantic/hinting at sexual things, if that makes sense). I'm not really sure where a good place to look would be and would appreciate any ideas! I'm open to checking out books as well as online resources. I'm a little rusty with figure drawing- I used to do it all the time but have been doing a lot of graphic design lately so I could use all the help I can get! Thank you guys!