Sociologists who have studied sexual orientation have concluded that sexual orientation

can be fluid over the life course

Explanation:

Fluid means it doesn't stay fixed all the time some people change their sexual orientation at some point in their lifetimes cause they feel they are not really made to be in that sexual orientation and they change into other sexual orientation. We have seen this more often in our present days people going to surgery to change their sexual orientation or using other ways but it is never fixed atleast not for everyone.