The risk is having a high frequency of partners and anal sex (passive or active) without condoms. That can very well be the case of an heterosexual male. A lucky one, by the way.
Not higher risk in this case! This should actually lower risk by raising the bar for everyone:
The new regulation excludes individuals who have had protected or unprotected anal intercourse with a new sexual partner in the past four months, regardless of gender or sexual orientation.
This hedges against sexual tourism, with further restrictions on donors who have recently gotten tattoos or tick bites, which can be potential vectors for disease.
This is good, as blood-borne pathogens are on the rise in different populations these days, and this will keep recipients safer.
