Is the phrase Semen-filled Sheets an example of Alliteration?

First of all you cant fill sheets. Secondly, Semen-stained Sheets would be a better use of alliteration, but I don't understand why you would want to use this in pros/poems unless it is of an erotic nature.

However the use of "stained" may indicate a negative connotation as a stain is something you would want to get rid of, something disliked.