Javier and his wife are preparing to have sex. his penis becomes erect and his testes "pull up." he is likely to be in the stage of the sexual response cycle according to masters and johnson.

I am pretty sure he is likely to be in the excitement stage of the sexual response cycle according to Masters and Johnson. Excitement stage of the sexual response cycle includes increased muscle tension, quickened heart rate and increased bloodflow to the genitals. This situation reflects all these symptoms.