Catullus 16 is famous among Catullus's Carmina because it is so sexually explicit that a full English translation was not openly published until the late twentieth century
The poem is famous among classicists as a benchmark of classical obscenity and invective.
Catullus addresses the poem to two unknown men, Furius and Aurelius, who are perhaps competing poets, perhaps mere constructs, since invective poetry was popular at the time. Modern Catullus scholarship speculates that they are likely the same people referred to in Catullus 11 and other poems. Apparently, Furius and Aurelius find Catullus's verses to be mollici (soft, perhaps "wussy" in modern slang). Catullus responds with intense abuse and invective.
The following adaptation attempts to convey the attitude of this poem:
yes, you, Aurelius--you fucking cocksucker--and you too, Furius, you faggot!
Just because my verses are tender doesn't mean
that I've gone all soft. Sure, a poet should focus
on writing poetry and not on sex; but does that
mean they can't write about sex? If a poem is
in good taste, well-written and erotic,
it can give massive boners to hairy old men,
not just to horny teenagers. You think I'm a sissy
just because I write about thousands of kisses?
I'm gonna fuck you guys up the ass and shove my cock down your throats!