It's really pretty easy to understand even as a gay man -- straight men are attracted to women, physically. So naturally they would be stimulated by women naked and engaged in sexual activity with a man, right? Well, what would girl on girl be like? It's TWO people you're attracted to -- both of them -- engaged in sexual activity. It's like exponential stimulation. I don't know why you wouldn't be into that if you liked women (besides being some amount of homophobic), because it seems only logical.
Isn't it obvious that *spoilers* The women in the beginning is carla going down to the submarine, hence why simmons had a recording left fore carla telling her about her mission in edonia And they then show right after that ada , out of the submarine in a building, fully clothed in a building talking to simmons. She then goes down to the submarine fully clothed. This scene can be looked at as a flashback into present time, or just letting you know naked ada was carla
Pretty much this.
"Your effort is for naught. How long do you plan to keep this up?" ~Haunting Ground
The woman emerging out of the suit naked is the Ada copy made by Simmons.
1) She's naked because she emerged naked from her cocoon that way. I assume she made a quick escape from the lab without bothering to cloth herself and went rogue behind Simmons' back.
2) If you look closely at her eyes (the naked one), you'll see there is a shade of blue. This is the same as the Ada copy in the blue blouse. (The real(?) Ada in red/black has hazel colored eyes.)
3) When Ada (red/black) views the projector, she says she doesn't remember taking the order and that someone else took it. Since the ship is set to allow Ada's entry, Ada's copy was able to enter the ship 6 months prior to the red/back Ada. This would explain why/how Ada copy knew about/was at the incident in Edonia.