My boyfriend semen tastes horrible!! ?

okay so i tol dmy boyfriend i would swallow for him and when his semen entered my mouth i nearly threw-up it wasnt the worse ive tasted but close to it!! so far i swallowed 3 times for him and all the times i gagged or choked on it!! i tryed keeping my tounge lifted up so it would go under my tounge and it doesnt taste tht bad but still bad!! he doesnt eat vegtables or fruits only meat and i heard tht would make it taste bitter!! what are some foods of drinks tht would make it taste sweeter? i heard pinapple juice but he wont drink it and i dont want to tell him its discusting!!!