I don't know what you guys have planned, so I'm going to spill these thoughts based on what I experienced.

Moving my character up and down to insert my junk into the girls holes was quite the challenge lol.
There should be a feature that positions you properly straight away, since its something practically everyone is going to do, and frequently.

Often times I couldnt even tap the vagina, because it was so difficult to get into.
I was forced to do anal, like the whole time! Darn my luck!
My penis was like magnetically attracted to the asshole.

I would consider this feature to be a necessity.

I had the same problem with every girl except the black one. Well, that is the pose of her sitting on the bed which is probably the sexiest pose I've seen but she is exposing her pussy for easy entry so it shouldn't be difficult. Perhaps an easy answer would be to allow the user to arch the back with CTRL exposing the vaginal region. The asshole is easier to get into than the pussy. I tried using the CTRL to kind of hold my penis and guide it when trying to first enter the girl but even that wouldn't really work.

I don't have this problem at all and I actually kind of like the idea of needing to aim correctly or accidentally sliding into the wrong hole

We don't need to casualize sex. The more challenge the better; it makes the game fun.

There are plenty of other games where you can just click to thrust if that's what you're looking for.

Put simply, the challenge has to fit the reward.

I actually meant to mention an optional "Manual" mode, because I quite like manual control at times. I must've assumed it was inferred by my statements.

If I dont like a movie, I'm not going to wait outside a theater all night to ensure that I get tickets.
Same concept applies here... Unless the experience of nailing a virtual chick is worth my awkward, unrealistic, and tedious efforts, then I'm not going to enjoy the challenge.

This is the very same reason why the story elements currently fail.

If plowing a girl down a row of school desks isn't your idea of a reward, I don't know what you're looking for in this game.

Your standards are really low and simplistic, which suggests that you would be satisfied with any number of the poorly thrown together sex games out there -- which is fine for a user like yourself, who is apparently easily satisfied by anything related to sex.
I, however, am not, and expect a certain level of quality when certain resources are available.
There is much potential to exploit, and it should be exploited, whether it be tomorrow, or next year, and its things like this that will prevent me from playing this game, as well as many others.

It's essential to understand the majority of your consumers when you're making a game, and I'd definitely consider you the minority.
The one who's willing to dick around (no pun intended) for ages just for the opportunity to put his virtual penis into a virtual female's vagina.

Though, you've nothing to fear. I doubt they'd get rid of the manual gameplay entirely.

Shift, that's rather condescending and some people would considering it borderline baiting. There's no need to get personal.

Auto aim could be optional and would be useful. Also, having the girl guide you in with her hand would be nice but I have no idea if the girls will be able to grab and use objects on themselves as well... I certainly hope so!

I agree that it should be easier. As it is now, it feels more like a jet refueling simulator than a sex game.