.:about sex:.

so sexual orientation definition :
if you have sex with a person of different sex as yours, you are heterosexual,
if you have a sex with a person of same sex as you, then you are a homosexual (now a days homosexuality has acquired multiple meanings).
if you have sex with people, both, your sex and the opposite, you are bisexual..
my point is;
if in the case that a man and a woman in a stable relationship have sex, but... but this is by her using a strap and penetrating him in every single occasion that they have had sex (with out him penetrating her), what does this make them????