When Jim Shooter got to write the Legion book again in 1976, he wrote profiles for all of the members- and perhaps most interestingly the sex lives of most of the characters are a part of the profiles
https://www.legionworld.net/forums/ubbthreads.php?ubb=showflat&Number=592096#Post592096

>Saturn Girl - is a wild, wild woman in bed, who undoubtedly has occasionally accompanied Lightning Lad on his forays into Dream Girl's boudoir.
>Triplicate Girl/Duo Damsel - there were some jokes made about the two for one bit long before B.B. courted D.D. -- probably the Legion guys were afraid of messing with D.D. because of the razzing they'd get, werd sex humor and suspicion of troilistic perversion, etc. I'm sure D.D. got some funny looks occasionally from the Legionnaires. A girl with a power so weirdly suited to weird sex (and not much else) has reason to wonder what's aid behind her backs.
>Chameleon Boy- he can identify with beauty the other Legionnaires misss. He could turn up with a shaggy, horned alien chick as easily as Elwinda. Liberal, he is -- even philosophical. And probably a little kinky.
>Star Boy- dumb. And probably hung like a horse, which will be the deciding factor in Dream Girl's settling down with him
>Shrinking Violet - She gets all her weird sex from Duplicate Boy and waiting and worrying just makes it sweeter.
>Ultra Boy- makes gentle, tender (and expert) love to Phantom Girl and saves his occasional forays into the bizarre for someone less angelic to him -- say, Dream Girl.
>Light Lass a good match for Timber Wolf when who needs a non-dominant, pleasant and patient girl. I think she is actually very feminine. She used to wear high heels!

>Dream Girl - is dumb. Her power is more or less hit or miss in value , and I'm sure her main service to the Legion is in her quarters after dark.She needs constant reassurance of her value,...the only way to get psychologically stroked is to allow herself to be physically stroked.