It's difficult not to interpret that in a lewd way.
*snicker guffaw*
I have decided that I need more detail for my perception-meddling stuff:
Disclaimer: I haven't tested it that much. It's easier to change a perception if you want it to change, or if the existing perception is unclear. I was able to use this to switch between perceiving myself as feminine and masculine, and to see a trans person as a woman despite the many signs that they were AMAB. This might work well because femininity and masculinity have... an associated feeling or sense? I think that might be necessary.
Description: This is a technique for altering a perception. It does not affect the actual visual stimulus, but the end result of the interpretation of that stimulus.
Steps:
1. Do something... sort of like meditation? Or like falling asleep? But only do it halfway. Reality should be wobbling or warping at the edges of your vision, and it should be kind of hard for your thoughts to focus.
2. Take one thing. For me it was either myself or a trans person in the room.
3. Imagine an alteration to a perceived quality of that thing. This is easier because you are partially asleep. For instance, for the "trans person in the room," it was kind of weird to have half the signals as "male" (voice, shoulders) and half as "female" (clothes, etc.), it was a bit unsettling. So I twisted the way I saw that person - not the signals themselves, but the resulting classification. There should be a sense of "that person is male" or "that person is female."
a. This will not work on direct observations, AFAICT. I haven't been able to convince myself that blue was red, but I was able to convince myself that a particular person (myself or somebody else appeared feminine, even though direct observation would contradict that.
b. This is somewhat hard to explain, but you need to be asleep/meditating because otherwise your mind will keep asserting reality onto your perceptions. If you're partially asleep or meditating, you can change perceptions in nonsensical ways.
4. This is the tricky part - while holding "this object is Y" in your mind (while it's really X), wake all the way up. This can take a few tries. I just experimented until I figured out how to hold the perception constant.
5. Don't think about the contradiction. Oh shit, this is basically doublethink. Just... ignore that you are wrong? It's easier for some people than others.
Thankfully, you only need to go through this the first time you twist a particular perception - the mental motion of twisting a perception is familiar, so you should be able to do it even if you're completely awake. You can lose it over time, though, but a quick meditation and re-do of the above should fix that.
It's harder to keep this up for extended periods of time. Normally, refreshing it every once in a while should be fine, but if that's not good enough for you, try practicing a constant, minor mental force toward a given perception.
Also, it's not hard to reverse if need be. If you've managed to convince yourself that the sky is made of flies or some shit, don't worry. Just focus on one observation that makes up that perception and... "pull" the illusion away?