If can be so bold, organic scenes come from organic, natural and well written characters. You can have characters be Nymphomaniacs or outright perverts, and if the setting calls for it then that's not going to be side eyed by your target audience.
Although, as much as I...really, really would approve of more cowgirl content, please...do not feel you need to jump into the Adult bracket of games if you do not want to, or if that's just not your vision for a game. ^^ Passion should always rule the day when working on things like games, or any project really. You get a much better project if you're excited by your own work~