OK his English is wrong. Unfortunately it's not his first language.
Instead of being an ass, let's correct him.
Correction: Don't have sex like this.
5. Use a comma after introductory adverbs.
Examples:
"Finally, I went running."
"Unsurprisingly, I saw a duck when I went running."
Many adverbs end in "ly" and answer the question "how?" How did someone do something? How did something happen?
Also insert a comma when "however" starts a sentence, too. Phrases like "on the other hand" and "furthermore" also fall into this category.
Source
Correction: Unfortunately, it's not his first language.
