For the more sexually adventurous, electric powered mechanical sex seats and fetish equipment like neck braces, casts, catheters, crutches, straitjackets, bondage, electrostimulators, mouth spreaders, and speculum devices exist.
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Men with a permanent Indwelling Catheter IDC can remove or fold back and cover with a condom or otherwise secure to penis shaft.
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All good reasons to engage in regular wheelchair sex.
For women after an initial absence of menstrual cycles fertility is rarely compromised.