List of people Courier Six has done the do with:
-Ringo
-Chet
-Deputy Beagle
-Colonel Hsu
-Picus
-Benny
-Swank
-The King
-Pacer
-James Garret -Old Ben -Fisto -Vulpes -Silus -Private Sexton -Private Kowalski -Aurelius -Elder McNamara -Ulysses -Private Stone

those are just headcanons for my courier because she's a massive hoe

if my courier sides with the ncr, she remains with Ringo for the long haul and has several kids with him

if my Courier sides with Legion she remains with Picus for the long run and has several children with him

and if she fights for an independent Vegas, she gets with Elder McNamara and has several children, it's mostly a political move to ensure the Brotherhood of Steel remain neutral towards Vegas

she also has a child with Benny and one with Silus as a result of her flings with them