Just tossing this out for observation and comment.

I have 2 cats in my household, a 4 year old spayed female and a 9 month old
female due for neutering soon. Both are quite contented, well adjusted to
each other and the household in general. Both have a normal interest in
dominating the attention of their favorite personalities within the home
which consists of myself, my wife, and an 8 year old son.

The 4 year old cat has developed a habit of following me into the bathroom
and snuggling herself down into the sink which is immediately next to the
commode where I am seated. Regardless of what she may have been doing prior
to me heading to the bathroom, she jumps up into the sink basin, circles a
few  times and nestles down, form fitting herself to the contour of the sink
as snugly as possible. She purrs quite strongly while doing this and
responds to petting and verbal interaction normally.

At no other time does she show the slightest interest in roosting in the
sink. I've heard of other cats who have a preference for sink nesting for
whatever reason it appeals to them but this *only* occurs when I am in there
using the facility. Recently the younger cat has begun following the 4 year
old on these ventures. Not to be outdone, she will hop up on the vanity,
circle past the older cat, walk across the toilet tank and climb up on my
shoulders to roost. Where did my privacy rights go?

It's not like either of them are lacking for attention throughout the rest
of the day but why such a heightened interest in me at this rather personal
moment? If I shut the door before they arrive, there will be paws under the
bottom of it trying to open it. Comments?