First and foremost, The boyfriend did not make that claim.
But also, corruption does not work that way. What do you want, an invoice? "One sex for so and so"?
If a politician takes money from a special interest, you don't say "but we can't prove it affected his decisions in any way!". So also with a reviewer who sleeps with people he's paid to pass judgment on.
Infidelity is especially bad, because it gives you extra reason to not disclose your conflict of interest.
Isn't it suspicious how little people care about the power dynamics of this? If a student sleeps with a teacher, that may be wrong by the student, but it's especially wrong by the teacher, who has the power in that unequal relationship. Same with driving instructors, parole officers etc. If you get too intimate with someone it is your job to judge, you're a tremendous ass and possibly a criminal. The dependent party also has a responsibility if they're adult and of sane mind, since they create a climate where improper relationships become the norm. Saying this doesn't matter is a slap in the face to all indie developers who wouldn't get that intimate with people judging their work.
So you see, we don't need an itemized invoice at all to say that this reflects extremely poorly on the gaming industry.