YOU SAID:
hes just a straight up guy
INTO JAPANESE
彼はただの真っ直ぐな男だ
BACK INTO ENGLISH
he is just a straight man
INTO JAPANESE
彼はただの異性愛者だ
BACK INTO ENGLISH
he's just a heterosexual
INTO JAPANESE
彼はただの異性愛者です
BACK INTO ENGLISH
he's just straight
INTO JAPANESE
彼はただまっすぐです
BACK INTO ENGLISH
he is just straight
INTO JAPANESE
彼はただまっすぐです
BACK INTO ENGLISH
he is just straight
That didn't even make that much sense in English.