Life partner is another one of those politically correct terms that appear everywhere these days.
Life partner = the person of the same or opposite sex that you live and eat with and sleep next to every night but are not married to.
From Dollar's general procedures and policies:
1.2 Additional Authorized Drivers: An additional authorized driver must satisfy the age requirements of
DOLLAR, have a valid driver's license and must meet other rental requirements, which vary by DOLLAR
location. This may include the requirement that the additional authorized driver present a major credit card
at the time of rental. At most DOLLAR locations, an additional authorized driver will be required to pay an
additional fee; however, spouses, employers, co-workers and others may not be required to pay this fee. An
additional authorized driver for a disabled renter is not required to pay any additional fee.