I don't think any of the three are swear words but wonder why you would wish to add a "e" to a perfectly adequate shorter word often used as an exclamation( even by me, though I prefer "merde" or "stronzo", but only in select company) !
Boobs is just an endearing diminutive and "sucks" as in "It sucks" a perfectly acceptable observation, albeit limited in scope, used in appropriate company.
I hate the anglosaxon c word. That is a swear word and ugly. Much prefer the French "con"!
, said with a shrugging of shoulders, movement of hand, pouting of lips, rolling of eyes, referring to people, things, actions, events, and generally denoting extreme stupidity.