Okay...
Language is best used in variations, ergo what happens in one scene, and how the narrator describes it (or the first-person voice, for those who use that style) should
change.
An example: one orgasm may make a person shout (especially if it is a
first orgasm), but if every character is like... "AAAAAAAH! AAAAAAAAH!" then it gets repetitive and lame. The occasional screaming orgasm is okay, but just like in real life, most of us do not scream every time.
Another example: Don't use the same adjectives to describe everything - not everything that has cum on it is 'glistening'. And don't even use words like 'tits' every time - some alternatives include breasts, boobs, ta-tas... and not every character uses the same word to describe things - one girl may refer to her breasts as boobs, and another might be inclined to call them tits, and yet another (perhaps shy/inexperienced) girl might think of them as breasts. Only immature men and drunken women would be likely to use 'ta-tas'.
And my final rant: don't use your slang/speech patterns for every character. Young girls are FAR more likely to overuse the 'um...' than a confident man - so let them speak differently. Another pet-peeve in erotica is when the writer doesn't reflect the accurate age of the person represented: a fourteen year-old girl was born
after 9/11/2001. Having that character speak in old-fashioned terms is stupid: "Golly, I just think those new records are just the bees knees, daddy-o. Let's skee-daddle over to the soda fountain and doo-wop all night, dig?"
That being said, who am I to tell others how to write? Sure, I have degree in English, but that does not an expert make. There exists such a thing as a learning curve.
One thing that doesn't bother me at all is the occasional spelling error, as long as I can tell what the author meant. I've read 'anchor' spelled 'anker' and it didn't throw me, so I didn't care. I've read 'stare' written as 'stair', and again, it didn't bug me at all.