Would a straight guy let a transgender doing him from behind?

Hi,

 I met this cool sweet guy who seems to have no experience but he has told me that he has been with many women  back in his life when he was 17-20 since now he just turn 21( but let me just tell you that he is a really but really bad kisser seems like he never kissed a girl or if he did only a few and seems not to have that much experience at least to me and to my parents , who he has met , he seem to have no experience )but in our second day of knowing each other( I think he really trust me to tell me this ) he told me that  one woman that he has been with was with a one night stand with was a  transgender who he let her do him from behind because he was curious to see what women felt and he did some research and found out that there is a G- stop back there for the male.. So he really wanted to try it and when this transgender came he did it with her... he let the transgender do him  from behind. I told him if he liked it and he told me that the pain he went though , it wasn't even worth that pleasure...also that he would have never done it with a guy since he told me guy a soo missy and dirty and he wanted someone that look like a female or a female to do him from behind so he can feel what it feel like... My question is , is he bi?? since I ask him if he was gay and he said no... also I don't know why he told me this things since I never ask for it he just brough it up as we were talking...also since he told me that he really likes me and he doesn't want to have any secret b/w us since he really wants to be my b/f... but I don't think a straight guy who really like females would let that happen or am I wrong ,,,PLEASE HELP!!!.. I really don't want to date a Bi or anything like that ...can someone tell me what they think ...thanks