You might not have room to hide a full or partial doll in your bedroom. An easy to carry homemade male masturbator is ideal. When the preferred tightness is achieved, secure the towel with rubber bands or a belt, to prevent it unfurling.
Once again, this comes back to the notion of having a hole to aim at. Whilst pocket pussies can be used simply for pleasure, there are other aspects that make them useful.
For instance, creating a sealed pocket in your inner tube that you can access from under water.
Physics demonstrates that friction builds a vacuum. Even many of the items advertised for the pleasure of couple don't ever address male genital contact, certainly not to the extent that female products do. This is when you feel pain, and it ruins the experience.
Unless you like the dry sensation of plain latex, you are also going to need some lube.
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For instance, you might opt to make a homemade flogger that you can use.