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Is there some scientific or technical reason to locate the lavatories near the plane exits? Wouldn't it create problems during evacuation, if the swing open doors gets unlatched etc on forced landing or some minor crash etc.

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    $\begingroup$ I disagree slightly, they're normally near the galley, which some exits are near to. It's easier to have everything that's not passenger seats together where possible from a plumbing and electric point of view. This is also where the crew are which is useful. Also emergency exits can't have seats next to them so putting them near the galley means more seats. $\endgroup$
    – Notts90
    Feb 14, 2017 at 12:40
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    $\begingroup$ I can't think of a plane with a lavatory door that swings out. I've only seen bifold doors that fold in. The only doors in the cabin that swing out are crew rest areas $\endgroup$
    – Graham
    Feb 15, 2017 at 10:28
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    $\begingroup$ so you can pee on your way out when there's an emergency. $\endgroup$
    – user428517
    Apr 14, 2017 at 20:23

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There could be numerous reasons,

Putting them near the galley centralizes non seat related things. It also allows you to run less piping as you can pump the same water to the sink in the lav as you would to the galley.

They may be located in a place where a tank can easily be fitted beneath them so as to minimize the amount of piping needed from unit to holding tank.

They are generally a convenient way to segment cabins as they provide an inherent wall (think between first and coach).

As for an emergency situation, Lav doors can generally be locked from the outside (I have seen the little metal flap above the slide often opens and allows you operate the slide). Its common place to do this prior to takeoff and landing. I would think its part of the emergency decent checklist as well so as to keep them shut. There is a discussion on it here.

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    $\begingroup$ And of course, there are obvious reasons to have the galleys near the doors, for ease of loading supplies. $\endgroup$ Feb 15, 2017 at 4:46

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