Why Do Women Wear Men's Shirts In The Morning (Post-Copulation)?

What is this phenomenon of girls wearing man's shirt in the morning (especially after sexual intercourse)? Films, photographs, and advertisements use this 'thing' so often, what message does such image try to convey? And does it happen in real life? If yes, then why? Is it due to blindly absorbing the influence of all-consuming mass media? Or does TV and Internet scoop it from the life and psychology of ordinary people for the sake of stuffing them full of something they already have/did/do but from the angle of 'I GIVE you an omelette, you know very well how to make it, you told me how to make it, you might be even sick of it, but you eat it as if it's a unique delicacy and then you try to reproduce it in your kitchen’? (HA-HA! What a fucking stupid fool you are, aren't you?! Hey guys! Look at this female ape wearing the male ape's shirt? HAHAHA)  

Well, who was first, the media or the people, it's quite a 'chicken or egg' question so let's move on and go back to the question why it exists. Googling this sentence I found a few options, so here they are:

‘'Officially' when a girl has sex, it is a big decision...By putting your shirt on, she tells herself that she is comfortable with you. She tells herself that you have the necessary qualities, habits and personalities which will allow her to feel at ease and somehow justifies the sex with you.'

'There's no special reason behind this thing. They should have something to wear on. And as they find boy's shirt easy to wear and also long enough they will put it on.'

‘She’s putting her scent on you and you don't know it, to ward other females off, your mine, smell me, this is why they wear perfumes and deodorants and stuff'

'we love wearing guys shirts, especially if they smell good, plus they are big, comfy, and it’s just this thing in our heads, we just gotta do it, next time just remember to bring and extra shirt (plus she probably wants to see you walking around shirtless' 
('it’s just this thing in our heads' illustrates the zombification of TV + naturalness of mammals of this type to mark their territory. As one of the comments said 'leave the scent')

'Smell of the shirt, which was on the man before sex – there are notes of his excitement and thirst for loved body'

‘Have you over-watched enough American movies? Women should wear overlaundered robe and the mother-in-law’s briefs' (from one Ukrainian forum)

'It looks really cute and sexy'

About this 'his smell' thing. If sex has happened after a date, and a date happened after working (usually stressful) day, perhaps he didn't get a chance to take a shower ( even if he did, there are still lots of sweat-provoking events ahead), then it is unlikely that he will smell sweet or sexual. (Well, as an option it will be a poisoning doze of cologne which will mingle with his natural stench to form something not at all attractive). During the actual date he might sweat too (especially if the date starts in restaurant (adhesive cooked meat odours) and somehow continues in a club, both places you two are definitely going to have a drink, meanwhile the sweat after the alcohol is becoming more tense) and during the foreplay and surge of adrenaline his body will produce a few drops of funk here there before he'll take off that precious shirt. And then, in the morning (I don't know, maybe by that time the entire stink of yesterday's sweaty-day has vanished?) she irresistibly gets into that stinking piece of cloth? Have you ever thought why men (again USUALLY) never wear the same shirt for two days? For fuck sake, even they don't want to touch their own shirt simply because it smells bad.

About this ‘to leave the scent' thing. I guess here we need to look at the degree of development of one or another woman, and how much the unconscious animal instincts govern her. Answers like 'it's comfy' are clearly lies that demonstrate the wild roots of this act that in fact would whisper in her ear something like 'C'mon! Piss on that shirt! Just a bit. Piss in his shoes! Piss on his neck while he asleep! Piss all over him! Piss! Mark your male! MARK! PISS!'

And what about girls that are not really skinny-dwarfs, or guys who are not muscle giants? Or the couples that are pretty similar in constitution and height? I'll give you my own example. My husband and I are both medium size, of course men’s shirts are made a bit differently but it's pretty much the same. So if I'd wear his shirt I'd shine my vagina and it would be chilly. (Although I do wear one of his shirts but just because I like the shirt and I wear it outside). Honestly, even after our very first sexes I never had a need or desire to do so, just because I think it’s lame and why would I do it? 

Ultimately, I believe that this phenomenon is nothing but an imposed (and irrelevant today) label, and I do not think that many really do it. A mythological element in tales about the relationship after sex. Same as passionate kisses in the morning, and the courage to share stinking breath, and other particles of something unpleasant created over the night. But that’s for another post. Cheers!