This thread is batshit.
Op if you were fresh out of the shower and still slightly menstruating the viscosity of the combined fluid in that area may have made it especially slippery, as they say slippery when wet.
This in turn could have led to his penis unintentionally moving to that area.
As another poster said why didn't you help guide it in ?, as for the period question, it's irrelavant, personally I never cared and neither did my h, I probably would have felt offended if I were with a man who were.
So what, we pick the partner who is compatible with our wants.
Op, you said you felt your relationship has been under strain, from your post I gather the problem is that he lost interest whilst being intimate, that is upsetting especially has he just left you hanging there.
Are you asking if you have a right to be upset, has this session got you thinking about something, you clearly felt disconected, you need to ask him, it could be many reasons, you both being ill, you being the instigator could this have made him feel less manly on this particular day, we don't know, your mind is doing overtime on this, what do you feel op ?
Hopefully, you'll just get back on the horse and it will be A ok next time.
Tell him you are upset.
But the question I'd like to ask is...
I mean it's not 2010 when we all have to pretend we're so insanely sex
crazed we just can't bear not having sex on the 4 days a month we are
shedding dead cells out our vagina.
What the hell happened in 2010, some sexual revolution and I missed out on it. 😳