Alright I played the current version, here is my feedback:
-Graphic settings dont do an awful lot, no matter how I set them, the overall look is'nt very nice.
-The water material is horrible
-No animation except for walking, standing and some sex (this has been pointed out earlier. At least add some from the marketplace if you cant be bothered to animate them yourself)
-The sex system is primitive.. too primitive. No camera controls except for 3 position presets that move the camera too far away to see anything,
-When I switch girls the character dissapears until I refresh the sex anim
-No physics? come on man its not that hard to add basic boob physics in ue4
-The character themselves could use a lot of work on their models and rigs still
-I killed the game after entering some lake in the middle of the island (probably the -z kill distance you wanna deactivate)
On the plus-side, the game feels like its running at 300fps with epic settings - but that doesnt surprise me that much as the graphics doesnt really look taxing.
So all in all I think you have still a lot of work to do before you can really call this a solid sex demo of your project.
Good luck with it.