When you say straight are you looking for strictly male/female porn with traditional gender roles?
Like would you be into girl/girl content (most straight guys are) or what about femdom, which would still be straight but maybe not what you mean.
I also doubt you'll find many porn games without some gay or futa content, though most allow you to ignore it.
Anyway I would suggest browsing itch.io because they seem to be one of the few sites that actually allow pornographic content. You need an account to browse 18+ content.
https://itch.io/
If you don't mind playing as a human girl, you might like this flash game?
https://www.newgrounds.com/portal/view/711164
If you haven't played Liliths Throne, it plays just like Fengames and you can change the settings to allow enemies to spawn always as furries and always as your preferred sex/gender.
https://lilithsthrone.blogspot.ie/?zx=47f73713ee032ee4
And if all else fails you can always look to Steam for Visual novels...