Straight guys, if you're being serious about it and the meaning of the word, don't receive BJs from guys. Period. Full stop. Or, for that matter, engage in direct sexual activity with men at all.
This is a tired old argument here, but it mostly comes down to:
1. One set of people, probably mostly heterosexuals, who seem to think that any sort of sex activity with someone of the same sex makes someone "gay", which is pretty patently a very binary way of looking at things and as it happens, not a very accurate way of looking at things.
2. Another set of people, probably mostly gay men and very strongly male-leaning bisexuals, who have a particular fantasy, not all that different to many straight guys' lesbian conversion fantasies, of "turning" a straight guy gay for them. Just from being here and elsewhere, there's obviously a sizable market for this niche.
3. More my own view, that there's probably a lot less "straight" people out there, in my understanding of people sticking to exclusive heterosexual relations and sexual desires, than has been thought, but there are at least a number of people of any sex, who are pretty much about 100% on the straight side, and a large number who have varying degrees of sex and sexual desire for both sexes (it occurs to me that transsexuals are a tricky area of gray for any schema), and then probably the last and least numerous group, of those who are exclusively gay as far as sex goes.
Half-formed, 3 a.m. thoughts. I've left out societal pressure on those in groups 2 and 3 above to become group 1: complete heteros. This is obviously a huge influence historically and into the present, and also calls into question the very individualistic view of sexual orientation that I usually see, where sex is down to the individual and their choices and ignores what is below or more correctly underlying, the level of the rational, choice-making individual (genetics, hormones, the very base levels of "nature") and that which is above or overlying and influencing the individual (society from the family, media, institutions, etc. etc.).
Just thoughts. And now it's time for me to get ready for the day.