what are the signs of guys being really aroused?

Question

i was just wondering how to tell when my boyfriend is really turned on, like when i give him oral he heavy breaths but apart from an erection what are the other ways? i have noticed each time his eyes become sort of blood shot is this when he is aroused? because its everytime i give him oral

Answer 1

His pupils will dialect

penis gets bigger

breathing becomes shallow

clammy hands

sweating

...you must give great oral!

Answer 2

listen to his breathing...and what his hands are doing...how they're caressing

Answer 3

erection. . . you knew that