Male budgie pulling tail of Female

FaeryBee said:

The behavior may be hormonal or it may be the male trying to show dominance over the female.
Please answer the questions below.

Are you doing everything necessary to prevent breeding?
Are either (or both) of the two budgies in breeding condition at this time?

When you have a mixed gender pair, it is very important to do everything necessary to prevent breeding.
Budgies are much healthier and happier when they are never bred.

A Heartfelt Plea to All Members
Tips For Discouraging Breeding
Before You Ever Consider Breeding Your Budgies
Guidance for Breeding Advice Threads

Rearranging their cage frequently will help tremendously.
Please be sure you never put a nest box or anything that could be used as a nesting site in their cage.
When they come into condition, you need to limit the light they get to 8 hours a day and limit the amount of protein in their diet.

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No breeding here for sure! They don’t cuddle, preen each other or feed each other.
They are usually only in their cage at night otherwise they have free flight in our living room, with plenty of places to play. I have been watching them and their behaviour over the last week and he does it when she tries to fly away from him. She shows no interest in him other than to antagonize him.