Surprising to some, and possibly not so surprising to the others.
The real issue here is that of the established pattern of sexual behavior.
A str8 dude may have 'experimented' while in HS/college or while serving the military or while being in an environment where access to the available females was limited.
If we are talking one or several such experiences under those specific limiting circumstances, we are really talking about the well-known phenomenon of situational homosexuality in str8 men. Statistically, this counts, since the test persons confirm that they have had sex with the members of the same sex while still seeing themselves as heterosexual. Practically, the matter has relatively little practical importance. Once past the age of experimentation, and once out of the environment conducive to situational homosexuality, most str8 men will return to their usual pattern of sexual behavior, i.e, to dating women. Much as we would want them to be homosexual, bi or pansexual, such men are both functionally and practically straight.
Another issue is that of the str8 men who may have experienced situational homosexuality at one or the other particular stage of their lives, and are now viewing m2m sex as a viable alternative to their declared pattern of sexual behavior being m2f sex. Some of these men identify themselves as being bi, closeted homosexuals, DL, or simply just opportunists. These guys have developed a pattern of sexual behavior that includes m2m sex, too.
Focusing the research on someone's somewhat anecdotal past vs. their functioning patterns of sexual behavior makes for a cool discussion or gossip topic but does not really hold much significance in practical, daily life terms of men.