henno13 wrote...
Or they could turn it off completely according to certain circumstances if you've imported.
No. First of all, many people will have ended up going with hetero romances in the previous game because there were no homosexual romances to be had. Because of this, quite a few people who would have rather gone with homosexual partners, but wanted to participate in a romance line, were forced to approach hetero relationships. Effectively, what this means is they would be punishing people who import their old characters because of an oversight in their own game design.
Second, with the inclusion of same sex opportunities, besexuality becomes a legitimate choice for your Shepard. By saying, "you can't have a same sex relationship in game 3 because you dated Miranda in game 2" you are effectively limiting Shep's sexual options again - which is precisely what they're trying to change by adding SS options.
Personally, I liked the approach in DA2, where dialogues which would further relationships were clearly labeled with icons - as were options which stopped that sort of thing in its tracks. (I never had an instance where, once I had chosen the broken heart icon in DA2, a character continued to hit on me ... not unless I started choosing heart icons again later)