Сладко в рот, да горько в глот
See Любишь кататься, люби и саночки возить (Л)
Cf: Honey is sweet, but bees sting (Am.). Honey is sweet, but the bee stings (Br.). No pleasure without repentance (Am.). Pleasure has a sting in its tail (Br.). What is sweet in the mouth is oft bitter in the stomach (Br.)
Русско-английский словарь пословиц и поговорок.
Академик.ру.
2013.