Lactation isn't exactly a turn on for me, but it's not an active off, either.  If it's not going to be every scene, have fun.<br/><br/>I've not had an oviposition RP, that might be fun.  (And have verisimilitude.)<br/><br/>Aphrodisiacs are fine.  Especially if they're the kind that erode your will instead of breaking it.  :)