I do not know why people criticizes much this series... Well in a sense i can understand since the Main Character is full of bullshit and has a superiority complex that all women would fall for him.
I dropped the series because how much anger this main character gave me(also back then the series wasn't finished translation too)... and for worst most of the girls do actually spread their legs to him so easily as if he was some kind of god!
That is the only bullshit i find on the series which made me drop it.

HOWEVER!!!! There is another side of the coin...

You have too look into the deep meaning of this story... and years after i first read this manga and dropped it, and after i encountered it again, i realize a few things based on comments and actions of real life men around the world and the bullshit they write on comments and forums regarding sex (and hentai).

This story shows that going banging girls around is not a game, that sex is not a game, that cheating is not "fun and games".

It shows that THERE ARE CONSEQUENCES for irresponsibility.

Many people i've seen around (Which I take the chance to give them a slap of reality when i encounter them), complaining and writing comments about harem anime/manga when the Mc shows hesitant to bang a girl, the people call this Mc a wimp, or sissy... when most of those Mc are just being RESPONSABLE.

People actually want the Mc to just jump all the harem girls' bones, consequences be damned.
There are also actual people in realize who just go bang girls around without thinking about consequences or responsibilities and then run away like cowards when karma comes to them with a vengeance.

This story shows that... shows the result of a Man who bang any girls he encounter without thinking of the consequences that those actions could bring.
It shows how irresponsible sex WILL end up.
Shows how Irresponsible people who cares about nothing will end up.
This is not a game people.

A TRUE MAN takes decision based on analysis of the situation thinking responsibly and having in mind the consequences that could bring any and all actions he take on a negative level.

I guess this is the reason why most people, specially the men, who read this series don't like it.
Because its a slap of reality.
Yes, reality is not a fairy tale and if you act like this main character and act irresponsible, THERE WILL BE CONSEQUENCES.
Most of them in real life has already payed for theirs... but they just curse live or God, blaming anyone but themselves for their own actions.

So next time you want to jump an innocent girl's bones... mind break them, or abuse her, or rape, or just simply have casual sex for just a night of loveless passion... THINK OF UWA-KOI...
And measure your thoughts and possibilities before taking action.
BE A TRUE MAN, A RESPONSIBLE MAN.
--
Also, this also goes to women who lately also had been rising on these irresponsible acts and accepting sex plays without thinking on the consequences... and the story also reflects on them.
But you know what is sad?
That these people will never learn... and most of them will continue on doing the same mistakes.

People goes around saying: "yeah lets have sex, its all fun and it makes you feel good! nothing bad will happen!" or "Lets all be sex friends and have orgies or gang bangs, its all fun!" or "Lets go do some rape or sexual harassment, or mind breaking for the thrills!"
Then shit hits the fan and this happens... then you see them desperate and running like cowards when karma comes to reclaim the debts. This includes both men and women.

Even worst, the characters in this story were all children... which makes it worst... and in real life children also are being influence to participate in these "games" on their own without thinking on the consequences.

This story is a slap of reality to those who believe sex is just a game, a good thing to pass time... then something like this happens.
What saddens me is how people who engage in these acts make fun of those who actually are responsible and reserve themselves to participate in such things. Calls them lame and other things... because "nothing will happen"... boy how are they wrong... things does happen... bad things... real life is cruel. And those who refuse to engage in these acts are saving themselves from grief.

--
You know... at first when I started to read this story. I thought that with all the crap the Mc went through in the beginning, he was going to try to make himself a better person, to strive to be better
I thought that it was going to be just another romance harem series with a Nice passive guy who is indecisive between the girls in his harem like most are and then in the end he had to chose or story would be inconclusive, boy was I wrong.... but no... he went the other way and became an irresponsible sociopath prick that acted without thinking on the consequences and then ruined many people's lives because of it... and worst is that He didn't care.
It was not until getting raped himself when he started to "Turn a new leaf" but by the it was too late.
His dark karma was way to big and heavy... and he didn't even get to start doing the right thing... as he was killed out of revenge by another dude who's mind got broken by these irresponsible actions and witnessed something that broke him.
The series ended as it did because the author tried to teach us something... teach us that reality is a bitch and if you are not responsible you have to pay dearly soon after for your actions.
In the end, everyone in the SF club paid for their sins in X or Y ways... some of them came out not so harmed than others but they still had to taste karma.
Sad thing is that that these people will never learn... and most of them will continue on doing the same mistakes over and over again without remorse or not caring about the consequences those actions will bring to themselves and the ones around them.
Honestly Yuki came out of it pretty easily... being run over by a trains is merciful compared to worst things that could happen.