Aside from sexual content and a few outliers, there's unfortunately no good selection of portals, or rather, no actual passage through or entry via a portal.
Well... not anymore!
This concept has been practiced with a variety of different portals and poses.
Simply use the standard trigger words and play with your imagination!
Want fiery portals? Use "fire" as the prompt.
Want a door as a portal? Use "door." And so on. Take a look at the example images if you need inspiration :)
There are very few limits to what you can do.
....... Yes.... you can also just do strait up sexual stuff if that is what you desire ^^
Please be aware that if you use this Lora at 1.0 strengh it might change the style (I recommend a strenght of 0.8, but you can test at your hearts content!)
Have fun!