When your male partner gets all romantic with his semen.

If it walks like a fish and it barks like a fish, then it's a fish.

It means "Them Antics" but it sounds like a French guy is saying it so he says sem antics.

when you say a word so much it starts to sound fucking weird

When people argue about the definition or meaning of a word. This usually starts in the middle of an argument and distracts from the main topic of the argument. Whether done intentionally or not depends on the people arguing.

When an argument deteriorates and its focus becomes one about word definitions rather than the main topic, a person will usually say "Oh, now we're just arguing semantics". Usually by this point, the arguement has become a waste of time because it has morphed into a bunch of bickering about irrelevant, unimportant details rather than the original main point.

If someone accuses you of arguing semantics, they're usually accusing you of intentionally avoiding the topic. In this case, the person may or may not be misusing the phrase in order to do so. If you're not actually arguing about word definitions, then they should accuse you of being nit-picky instead (as that would be more accurate) but to explain it to this degree becomes a bit nit-picky in and of itself and so for obvious reasons, this is the end.

adj.
Being against the arguing of meanings or definitions of words.

When a text (anything with words, whether it be spoken or written) has a topic or subject that a group of words relate to. If a passage of writing included the words
"heart", "flower", "love", "music", "passion" the semantic field would most likely be considered 'love'. A semantic field of love. Also the lexis may be referred to as "flowery" or even femnine